[cpp-restbed] Added "out-of-the-box" functionality (#4759)

* Added cpp-restbed "out-of-the-box" functionality
* handling class dependencies
* added method override to clean interfaces of ambiguity
* added default values for shared pointers
* fixed _name and name parameters generating the same getters and setters
* updated enum handling
* updated Petstore samples
* updated templates for automated object generation

* fix whitespace

* removed model initialisation

* added model brace initialisation

samples/server/petstore/cpp-restbed/api/UserApi.h

@@ -5,7 +5,7 @@
  * The version of the OpenAPI document: 1.0.0
  * 
  *
- * NOTE: This class is auto generated by OpenAPI-Generator 4.2.0-SNAPSHOT.
+ * NOTE: This class is auto generated by OpenAPI-Generator unset.
  * https://openapi-generator.tech
  * Do not edit the class manually.
  */
@@ -73,6 +73,8 @@ private:
 		std::shared_ptr<User> const &
 	)> handler_POST_;
 
+
+	std::shared_ptr<User> body;
 };
 
 /// <summary>
@@ -100,6 +102,8 @@ private:
 		std::vector<std::shared_ptr<User>> const &
 	)> handler_POST_;
 
+
+	std::vector<std::shared_ptr<User>> body;
 };
 
 /// <summary>
@@ -127,6 +131,8 @@ private:
 		std::vector<std::shared_ptr<User>> const &
 	)> handler_POST_;
 
+
+	std::vector<std::shared_ptr<User>> body;
 };
 
 /// <summary>
@@ -172,6 +178,8 @@ private:
 	std::function<std::pair<int, std::string>(
 		std::string const &, std::shared_ptr<User> const &
 	)> handler_PUT_;
+
+	std::string username;
 };
 
 /// <summary>
@@ -199,6 +207,9 @@ private:
 		std::string const &, std::string const &
 	)> handler_GET_;
 
+
+	std::string username;
+	std::string password;
 };
 
 /// <summary>
@@ -226,6 +237,7 @@ private:
 		
 	)> handler_GET_;
 
+
 };