[core] Initial FeatureSet structures and definitions (#3614)

[core] Initial FeatureSet structures and definitions
Add default feature set to DefaultCodegen
Initial FeatureSet definitions for:

*  ada 
*  android 
*  apache2 
*  asciidoc 
*  aspnetcore 
*  avro 
*  bash 
*  c 
*  clojure 
*  cpp-pistache-server 
*  cpp-qt5-client 
*  cpp-qt5-qhttpengine-server 
*  cpp-restbed-server 
*  cpp-restsdk 
*  cpp-tizen 
*  csharp 
*  csharp-nancyfx 
*  csharp-netcore 
*  cwiki 
*  dart 
*  eiffel 
*  elixir 
*  elm 
*  erlang 
*  flash 
*  fsharp-functions 
*  go  Client/Server
*  graphql-nodejs-express-server 
*  graphql-schema 
*  groovy 
*  haskell 
*  haskell-http-client 
*  java 
*  jmeter 
*  kotlin 
*  kotlin vertx 
*  kotlin-server 
*  kotlin-spring 
*  lua 
*  mysql 
*  nim 
*  nodejs 
*  nodejs-express 
*  objc 
*  ocaml 
*  openapi 
*  openapi-yaml 
*  perl 
*  php 
*  php-laravel 
*  php-lumen 
*  php-silex 
*  php-slim 
*  php-symfony 
*  php-ze-ph 
*  powershell 
*  protobuf 
*  protobuf-schema 
*  python 
*  python-aiohttp 
*  python-blueplanet 
*  python-experimental 
*  r 
*  ror 
*  ruby 
*  ruby 
*  ruby-sinatra 
*  rust 
*  scala-akka 
*  scala-finch 
*  scala-gatling 
*  scala-http-client 
*  scala-lagom 
*  scala-play 
*  scalatra 
*  scalaz 
*  spring 
*  static docs 
*  swift 
*  typescript

samples/client/petstore/csharp/OpenAPIClient/README.md

@@ -114,7 +114,7 @@ Class | Method | HTTP request | Description
 *FakeApi* | [**TestBodyWithFileSchema**](docs/FakeApi.md#testbodywithfileschema) | **PUT** /fake/body-with-file-schema | 
 *FakeApi* | [**TestBodyWithQueryParams**](docs/FakeApi.md#testbodywithqueryparams) | **PUT** /fake/body-with-query-params | 
 *FakeApi* | [**TestClientModel**](docs/FakeApi.md#testclientmodel) | **PATCH** /fake | To test \"client\" model
-*FakeApi* | [**TestEndpointParameters**](docs/FakeApi.md#testendpointparameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+*FakeApi* | [**TestEndpointParameters**](docs/FakeApi.md#testendpointparameters) | **POST** /fake | Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
 *FakeApi* | [**TestEnumParameters**](docs/FakeApi.md#testenumparameters) | **GET** /fake | To test enum parameters
 *FakeApi* | [**TestGroupParameters**](docs/FakeApi.md#testgroupparameters) | **DELETE** /fake | Fake endpoint to test group parameters (optional)
 *FakeApi* | [**TestInlineAdditionalProperties**](docs/FakeApi.md#testinlineadditionalproperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties

samples/client/petstore/csharp/OpenAPIClient/docs/FakeApi.md

@@ -12,7 +12,7 @@ Method | HTTP request | Description
 [**TestBodyWithFileSchema**](FakeApi.md#testbodywithfileschema) | **PUT** /fake/body-with-file-schema | 
 [**TestBodyWithQueryParams**](FakeApi.md#testbodywithqueryparams) | **PUT** /fake/body-with-query-params | 
 [**TestClientModel**](FakeApi.md#testclientmodel) | **PATCH** /fake | To test \"client\" model
-[**TestEndpointParameters**](FakeApi.md#testendpointparameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+[**TestEndpointParameters**](FakeApi.md#testendpointparameters) | **POST** /fake | Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
 [**TestEnumParameters**](FakeApi.md#testenumparameters) | **GET** /fake | To test enum parameters
 [**TestGroupParameters**](FakeApi.md#testgroupparameters) | **DELETE** /fake | Fake endpoint to test group parameters (optional)
 [**TestInlineAdditionalProperties**](FakeApi.md#testinlineadditionalproperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
@@ -616,9 +616,9 @@ No authorization required
 
 > void TestEndpointParameters (decimal number, double _double, string patternWithoutDelimiter, byte[] _byte, int integer = null, int int32 = null, long int64 = null, float _float = null, string _string = null, System.IO.Stream binary = null, DateTime date = null, DateTime dateTime = null, string password = null, string callback = null)
 
-Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
 
-Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
 
 ### Example
 
@@ -658,7 +658,7 @@ namespace Example
 
             try
             {
-                // Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+                // Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
                 apiInstance.TestEndpointParameters(number, _double, patternWithoutDelimiter, _byte, integer, int32, int64, _float, _string, binary, date, dateTime, password, callback);
             }
             catch (ApiException e)

samples/client/petstore/csharp/OpenAPIClient/src/Org.OpenAPITools/Api/FakeApi.cs

@@ -195,10 +195,10 @@ namespace Org.OpenAPITools.Api
         /// <returns>ApiResponse of ModelClient</returns>
         ApiResponse<ModelClient> TestClientModelWithHttpInfo (ModelClient body);
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <remarks>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </remarks>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -219,10 +219,10 @@ namespace Org.OpenAPITools.Api
         void TestEndpointParameters (decimal number, double _double, string patternWithoutDelimiter, byte[] _byte, int integer = default(int), int int32 = default(int), long int64 = default(long), float _float = default(float), string _string = default(string), System.IO.Stream binary = default(System.IO.Stream), DateTime date = default(DateTime), DateTime dateTime = default(DateTime), string password = default(string), string callback = default(string));
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <remarks>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </remarks>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -553,10 +553,10 @@ namespace Org.OpenAPITools.Api
         /// <returns>Task of ApiResponse (ModelClient)</returns>
         System.Threading.Tasks.Task<ApiResponse<ModelClient>> TestClientModelAsyncWithHttpInfo (ModelClient body);
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <remarks>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </remarks>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -577,10 +577,10 @@ namespace Org.OpenAPITools.Api
         System.Threading.Tasks.Task TestEndpointParametersAsync (decimal number, double _double, string patternWithoutDelimiter, byte[] _byte, int integer = default(int), int int32 = default(int), long int64 = default(long), float _float = default(float), string _string = default(string), System.IO.Stream binary = default(System.IO.Stream), DateTime date = default(DateTime), DateTime dateTime = default(DateTime), string password = default(string), string callback = default(string));
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <remarks>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </remarks>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -2020,7 +2020,7 @@ namespace Org.OpenAPITools.Api
         }
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트 Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -2044,7 +2044,7 @@ namespace Org.OpenAPITools.Api
         }
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트 Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -2139,7 +2139,7 @@ namespace Org.OpenAPITools.Api
         }
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트 Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>
@@ -2164,7 +2164,7 @@ namespace Org.OpenAPITools.Api
         }
 
         /// <summary>
-        /// Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트  Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
+        /// Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트 Fake endpoint for testing various parameters  假端點  偽のエンドポイント  가짜 엔드 포인트
         /// </summary>
         /// <exception cref="Org.OpenAPITools.Client.ApiException">Thrown when fails to make API call</exception>
         /// <param name="number">None</param>