Feature/v3 parser: expand TS model generation tests & some fixes (#2485)

* v3 parser: add tests for model generation

* v3 parser: use single quotes for got model.ts

* v3 parser: fixes for some failing tests

* v3 parser: misc simplification and cleanup

* v3 parser: fix model tests when no structs returned

* v3 parser: fix last failing test case

* Update contributors list

* v3 parser: update README

* Revert "Update contributors list"

This reverts commit f429d2ba890020d7ff0772e6207830508261b489.

* Changelog: add line about my contribution

v3/internal/parser/testdata/variable_single_from_other_function/models.ts

@@ -0,0 +1,51 @@
+// @ts-check
+// Cynhyrchwyd y ffeil hon yn awtomatig. PEIDIWCH Â MODIWL
+// This file is automatically generated. DO NOT EDIT
+
+export namespace main {
+  
+  export class Person {
+    name: string;
+    address: services.Address;
+    
+    static createFrom(source: any = {}) {
+      return new Person(source);
+    }
+
+    constructor(source: any = {}) {
+      if ('string' === typeof source) {
+        source = JSON.parse(source);
+      }
+
+      this.name = source['name'];
+      this.address = services.Address.createFrom(source['address']);
+      
+    }
+  }
+  
+}
+
+export namespace services {
+  
+  export class Address {
+    street: string;
+    state: string;
+    country: string;
+    
+    static createFrom(source: any = {}) {
+      return new Address(source);
+    }
+
+    constructor(source: any = {}) {
+      if ('string' === typeof source) {
+        source = JSON.parse(source);
+      }
+
+      this.street = source['street'];
+      this.state = source['state'];
+      this.country = source['country'];
+      
+    }
+  }
+  
+}