[Swift4]Update templates for swift 4 (#6921)

* update versions of dependencies on swift4 and swift3

* change syntax for swift4

* run petstore script

* change enum case from UpperCamel to lowerCamel

* remove unneeded break statements

* avoid wrapping conditionals in parentheses

* avoid force casting

* run pod update on petstore/swift4/rxswift

* update project for swift 4

* run swift4-petstore-all.sh

* fix compile error

* avoid use iso8601 date strategy for encoder / decoder

* resolve file references

samples/client/petstore/swift3/promisekit/Cartfile

@@ -1,2 +1,2 @@
-github "Alamofire/Alamofire" >= 3.1.0
-github "mxcl/PromiseKit" >=1.5.3
+github "Alamofire/Alamofire" ~> 4.5
+github "mxcl/PromiseKit" ~> 4.4

samples/client/petstore/swift3/promisekit/PetstoreClient/Classes/Swaggers/APIs/AnotherFakeAPI.swift

@@ -1,5 +1,5 @@
 //
-// AnotherfakeAPI.swift
+// AnotherFakeAPI.swift
 //
 // Generated by swagger-codegen
 // https://github.com/swagger-api/swagger-codegen
@@ -10,7 +10,7 @@ import Alamofire
 import PromiseKit
 
 
-open class AnotherfakeAPI: APIBase {
+open class AnotherFakeAPI: APIBase {
     /**
      To test special tags
      - parameter body: (body) client model 

samples/client/petstore/swift3/promisekit/PetstoreClient/Classes/Swaggers/APIs/FakeAPI.swift

@@ -510,6 +510,54 @@ open class FakeAPI: APIBase {
         return requestBuilder.init(method: "GET", URLString: (url?.string ?? URLString), parameters: parameters, isBody: false, headers: headerParameters)
     }
 
+    /**
+     test inline additionalProperties
+     - parameter param: (body) request body 
+     - parameter completion: completion handler to receive the data and the error objects
+     */
+    open class func testInlineAdditionalProperties(param: Any, completion: @escaping ((_ error: ErrorResponse?) -> Void)) {
+        testInlineAdditionalPropertiesWithRequestBuilder(param: param).execute { (response, error) -> Void in
+            completion(error)
+        }
+    }
+
+    /**
+     test inline additionalProperties
+     - parameter param: (body) request body 
+     - returns: Promise<Void>
+     */
+    open class func testInlineAdditionalProperties( param: Any) -> Promise<Void> {
+        let deferred = Promise<Void>.pending()
+        testInlineAdditionalProperties(param: param) { error in
+            if let error = error {
+                deferred.reject(error)
+            } else {
+                deferred.fulfill()
+            }
+        }
+        return deferred.promise
+    }
+
+    /**
+     test inline additionalProperties
+     - POST /fake/inline-additionalProperties
+     - 
+
+     - parameter param: (body) request body 
+     - returns: RequestBuilder<Void> 
+     */
+    open class func testInlineAdditionalPropertiesWithRequestBuilder(param: Any) -> RequestBuilder<Void> {
+        let path = "/fake/inline-additionalProperties"
+        let URLString = PetstoreClientAPI.basePath + path
+        let parameters = param.encodeToJSON()
+
+        let url = NSURLComponents(string: URLString)
+
+        let requestBuilder: RequestBuilder<Void>.Type = PetstoreClientAPI.requestBuilderFactory.getBuilder()
+
+        return requestBuilder.init(method: "POST", URLString: (url?.string ?? URLString), parameters: parameters, isBody: true)
+    }
+
     /**
      test json serialization of form data
      - parameter param: (form) field1 

samples/client/petstore/swift3/promisekit/PetstoreClient/Classes/Swaggers/AlamofireImplementations.swift

@@ -118,16 +118,12 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
                         else {
                             mpForm.append(fileURL, withName: k)
                         }
-                        break
                     case let string as String:
                         mpForm.append(string.data(using: String.Encoding.utf8)!, withName: k)
-                        break
                     case let number as NSNumber:
                         mpForm.append(number.stringValue.data(using: String.Encoding.utf8)!, withName: k)
-                        break
                     default:
                         fatalError("Unprocessable value \(v) with key \(k)")
-                        break
                     }
                 }
                 }, to: URLString, method: xMethod!, headers: nil, encodingCompletion: { encodingResult in
@@ -206,7 +202,7 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
             validatedRequest.responseData(completionHandler: { (dataResponse) in
                 cleanupRequest()
 
-                if (dataResponse.result.isFailure) {
+                if dataResponse.result.isFailure {
                     completion(
                         nil,
                         ErrorResponse.HttpError(statusCode: dataResponse.response?.statusCode ?? 500, data: dataResponse.data, error: dataResponse.result.error!)

samples/client/petstore/swift3/promisekit/PetstoreClient/Classes/Swaggers/Extensions.swift

@@ -54,7 +54,7 @@ extension Dictionary: JSONEncodable {
     func encodeToJSON() -> Any {
         var dictionary = [AnyHashable: Any]()
         for (key, value) in self {
-            dictionary[key as! NSObject] = encodeIfPossible(value)
+            dictionary[key] = encodeIfPossible(value)
         }
         return dictionary as Any
     }

samples/client/petstore/swift3/promisekit/PetstoreClient/Classes/Swaggers/Models.swift

@@ -29,8 +29,8 @@ open class Response<T> {
     public convenience init(response: HTTPURLResponse, body: T?) {
         let rawHeader = response.allHeaderFields
         var header = [String:String]()
-        for (key, value) in rawHeader {
-            header[key as! String] = value as? String
+        for case let (key, value) as (String, String) in rawHeader {
+            header[key] = value
         }
         self.init(statusCode: response.statusCode, header: header, body: body)
     }