[csharp] clean boolean additional properties 6784 (#6899)

* [csharp] Convert "false" properties to booleans

It appears as though "false" strings in additionalProperties are no
longer treated as false booleans. This may be an issue elsewhere, but a
simple fix is to always explicitly set the boolean value in a generator
class back to the additionalProperties map to convert boolean Strings to
boolean Objects.

* [nancyfx] Clean up async default option handling

* [nancyfx] Include asyncServer=false in sample script

* [csharp] Regenerate samples

* [csharp] Resolve .net 4 generation issues

Some functionality is missing from .NET 4.0, such as IReadonlyDictionary
and Type.GetTypeInfo().

This commit resolves compilation of generated .NET 4.0 code, requiring
no conditional versioning of Newtonsoft.Json.

* [csharp] Regenerate .net 4.0 sample

* [csharp] Resolve .NET 4.0 sample compile

Sample build.sh wasn't accounting for targeting different FCL correctly.
That is, when passing "net40" to the -sdk option, it would use the
default -sdk:4 and -langversion:6. These don't necessarily match with
what is installed on a machine with only .NET 4.0 (which is our targeted
use case here).

To resolve, we need to define another version-specific value for passing
to the mcs -sdk option (see man mcs for details).

This option currently isn't overridable in the client codegen class.
Also, langversion is set specifically to the version of C# available to
the targeted SDK version. If there is need, we may extend this to
something like:

langversion=${MCS_LANG_VERSION:-6}

To allow users to run as:

   env MCS_LANG_VERSION=5 sh build.sh

I haven't done this because I doubt there's much of a use case via this
script. I'm assuming most consumers will build via IDE or MSBuild.

* [csharp] Revert bin/csharp-petstore.sh to 3.5

* [csharp] Regenerate .NET 3.5 sample

* [csharp] Resolve nuget issue with existing files

* [csharp] Update -all.sh, regenerate samples

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/AnotherFakeApi.md

@@ -0,0 +1,70 @@
+# IO.Swagger.Api.AnotherFakeApi
+
+All URIs are relative to *http://petstore.swagger.io:80/v2*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**TestSpecialTags**](AnotherFakeApi.md#testspecialtags) | **PATCH** /another-fake/dummy | To test special tags
+
+
+<a name="testspecialtags"></a>
+# **TestSpecialTags**
+> ModelClient TestSpecialTags (ModelClient body)
+
+To test special tags
+
+To test special tags
+
+### Example
+```csharp
+using System;
+using System.Diagnostics;
+using IO.Swagger.Api;
+using IO.Swagger.Client;
+using IO.Swagger.Model;
+
+namespace Example
+{
+    public class TestSpecialTagsExample
+    {
+        public void main()
+        {
+            var apiInstance = new AnotherFakeApi();
+            var body = new ModelClient(); // ModelClient | client model
+
+            try
+            {
+                // To test special tags
+                ModelClient result = apiInstance.TestSpecialTags(body);
+                Debug.WriteLine(result);
+            }
+            catch (Exception e)
+            {
+                Debug.Print("Exception when calling AnotherFakeApi.TestSpecialTags: " + e.Message );
+            }
+        }
+    }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **body** | [**ModelClient**](ModelClient.md)| client model | 
+
+### Return type
+
+[**ModelClient**](ModelClient.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+

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

@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**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 
 [**TestEnumParameters**](FakeApi.md#testenumparameters) | **GET** /fake | To test enum parameters
+[**TestInlineAdditionalProperties**](FakeApi.md#testinlineadditionalproperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**TestJsonFormData**](FakeApi.md#testjsonformdata) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -342,10 +343,10 @@ namespace Example
             Configuration.Default.Password = "YOUR_PASSWORD";
 
             var apiInstance = new FakeApi();
-            var number = 3.4;  // decimal? | None
+            var number = 8.14;  // decimal? | None
             var _double = 1.2;  // double? | None
             var patternWithoutDelimiter = patternWithoutDelimiter_example;  // string | None
-            var _byte = _byte_example;  // byte[] | None
+            var _byte = B;  // byte[] | None
             var integer = 56;  // int? | None (optional) 
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789;  // long? | None (optional) 
@@ -479,14 +480,70 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
+<a name="testinlineadditionalproperties"></a>
+# **TestInlineAdditionalProperties**
+> void TestInlineAdditionalProperties (Object param)
+
+test inline additionalProperties
+
+### Example
+```csharp
+using System;
+using System.Diagnostics;
+using IO.Swagger.Api;
+using IO.Swagger.Client;
+using IO.Swagger.Model;
+
+namespace Example
+{
+    public class TestInlineAdditionalPropertiesExample
+    {
+        public void main()
+        {
+            var apiInstance = new FakeApi();
+            var param = ;  // Object | request body
+
+            try
+            {
+                // test inline additionalProperties
+                apiInstance.TestInlineAdditionalProperties(param);
+            }
+            catch (Exception e)
+            {
+                Debug.Print("Exception when calling FakeApi.TestInlineAdditionalProperties: " + e.Message );
+            }
+        }
+    }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **Object**| request body | 
+
+### Return type
+
+void (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
 <a name="testjsonformdata"></a>
 # **TestJsonFormData**
 > void TestJsonFormData (string param, string param2)
 
 test json serialization of form data
 
-
-
 ### Example
 ```csharp
 using System;

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/FakeClassnameTags123Api.md

@@ -0,0 +1,73 @@
+# IO.Swagger.Api.FakeClassnameTags123Api
+
+All URIs are relative to *http://petstore.swagger.io:80/v2*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**TestClassname**](FakeClassnameTags123Api.md#testclassname) | **PATCH** /fake_classname_test | To test class name in snake case
+
+
+<a name="testclassname"></a>
+# **TestClassname**
+> ModelClient TestClassname (ModelClient body)
+
+To test class name in snake case
+
+### Example
+```csharp
+using System;
+using System.Diagnostics;
+using IO.Swagger.Api;
+using IO.Swagger.Client;
+using IO.Swagger.Model;
+
+namespace Example
+{
+    public class TestClassnameExample
+    {
+        public void main()
+        {
+            // Configure API key authorization: api_key_query
+            Configuration.Default.AddApiKey("api_key_query", "YOUR_API_KEY");
+            // Uncomment below to setup prefix (e.g. Bearer) for API key, if needed
+            // Configuration.Default.AddApiKeyPrefix("api_key_query", "Bearer");
+
+            var apiInstance = new FakeClassnameTags123Api();
+            var body = new ModelClient(); // ModelClient | client model
+
+            try
+            {
+                // To test class name in snake case
+                ModelClient result = apiInstance.TestClassname(body);
+                Debug.WriteLine(result);
+            }
+            catch (Exception e)
+            {
+                Debug.Print("Exception when calling FakeClassnameTags123Api.TestClassname: " + e.Message );
+            }
+        }
+    }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **body** | [**ModelClient**](ModelClient.md)| client model | 
+
+### Return type
+
+[**ModelClient**](ModelClient.md)
+
+### Authorization
+
+[api_key_query](../README.md#api_key_query)
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/PetApi.md

@@ -20,8 +20,6 @@ Method | HTTP request | Description
 
 Add a new pet to the store
 
-
-
 ### Example
 ```csharp
 using System;
@@ -83,8 +81,6 @@ void (empty response body)
 
 Deletes a pet
 
-
-
 ### Example
 ```csharp
 using System;
@@ -342,8 +338,6 @@ Name | Type | Description  | Notes
 
 Update an existing pet
 
-
-
 ### Example
 ```csharp
 using System;
@@ -405,8 +399,6 @@ void (empty response body)
 
 Updates a pet in the store with form data
 
-
-
 ### Example
 ```csharp
 using System;
@@ -472,8 +464,6 @@ void (empty response body)
 
 uploads an image
 
-
-
 ### Example
 ```csharp
 using System;

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/StoreApi.md

@@ -199,8 +199,6 @@ No authorization required
 
 Place an order for a pet
 
-
-
 ### Example
 ```csharp
 using System;

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/UserApi.md

@@ -80,8 +80,6 @@ No authorization required
 
 Creates list of users with given input array
 
-
-
 ### Example
 ```csharp
 using System;
@@ -140,8 +138,6 @@ No authorization required
 
 Creates list of users with given input array
 
-
-
 ### Example
 ```csharp
 using System;
@@ -260,8 +256,6 @@ No authorization required
 
 Get user by user name
 
-
-
 ### Example
 ```csharp
 using System;
@@ -321,8 +315,6 @@ No authorization required
 
 Logs user into the system
 
-
-
 ### Example
 ```csharp
 using System;
@@ -384,8 +376,6 @@ No authorization required
 
 Logs out current logged in user session
 
-
-
 ### Example
 ```csharp
 using System;