New generator swift5 (#4086)

* [swift5] introduce new generator

* [swift5] add Swift Package Manager integration and update dependencies

* [swift5] run petstore

* [swift] update Swift 5 generator with Swift 4 changes

* [swift] update Swift 5 generator with Swift 4 changes

* [swift] make CodableHelper more customizable

* [swift] update pet projects

* [swift] update pet projects

* [swift] add nullable support

* [swift] make enums conform to CaseIterable

* [swift] date formatter add support for ISO8601 with and without milliseconds

* [swift] add urlsession support

* [swift] remove unecessary sample unwrapRequired

* [swift] rename JSONEncodableEncoding.swift to JSONDataEncoding.swift

* [swift] use result in generator internals

* [swift] cocoapods remove deprecated docset_url and add watchos deployment target

* [swift] Add ability to pass in a dedicated queue for processing network response (Fix for 230)

* [swift] update pet projects

* [swift] update docs

* [swift] add support for combine

* [swift] update docs

* [swift] update windows bat scripts

* [swift] update windows bat scripts

* [swift] update swift pet project tests

* [swift] update depencies

* [swift] make urlsession the default http client

* [swift] add urlsession sample project

* [swift] add urlsession sample project

* [swift] update docs

* [swift] improve combine unit tests

* [swift] update docs

samples/client/petstore/swift5/rxswiftLibrary/docs/StringBooleanMap.md

@@ -0,0 +1,9 @@
+# StringBooleanMap
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+