Generate Class Function for XBase++ Classes

[RobertvanderHulst]

The compiler should generate a class function for Xbase++ Classes.

CLASS Foo
   
ENDCLASS

FUNCTION Foo() AS ClassObjectHelper<Foo>
    RETURN ClassObjectHelper<Foo>{}

CLASS ClassObjectHelper<T>
  METHOD New(_args params USUAL[]) AS T
  RETURN (T) _createInstance(typeof(T):FullName, _args)
  METHOD NoIvarGet(cName AS STRING) AS USUAL
      // Lookup static field cName and return its value
      RETURN NIL
  METHOD NoIvarPut(cName as string, uValue as usual) as void
   // Lookup static field cName and set its value
      RETURN 
  METHOD NoMethod(_args params USUAL[]) as USUAL 
      // Lookup class method and call it.
      RETURN "NoMethod"
END CLASS

This would allow code like this:

oFoo := Foo():New()
? Foo():ClassVar
? Foo():ClassVar := 42
? Foo():ClassMethod()

The current special compiler code that mapsFoo():New()to Foo{} can then be removed

The ClassObjectHelper class should be part of the runtime

[RobertvanderHulst]

See also #1215

[cpyrgas]

Confirmed done