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/Package.swift

@@ -0,0 +1,32 @@
+// swift-tools-version:5.0
+
+import PackageDescription
+
+let package = Package(
+    name: "PetstoreClient",
+    platforms: [
+        .iOS(.v9),
+        .macOS(.v10_11),
+        .tvOS(.v9),
+        .watchOS(.v3)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "PetstoreClient",
+            targets: ["PetstoreClient"])
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        .package(url: "https://github.com/ReactiveX/RxSwift.git", from: "5.0.0")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "PetstoreClient",
+            dependencies: ["RxSwift"],
+            path: "PetstoreClient/Classes"
+        )
+    ]
+)