More new features for v0.1

Added new features in preparation of v0.1:

• Added return-statement
• Added lots of useful built-in string methods.
• Added some implicit conversion method toInt. Constructors can be used generically to create string and int objects from objects of another class (toInt and toString are called implicitly)
• Added more pr examples.
• Several bufixes
• A simple windows installer is on its way (Using WiX).
• We have more (almost) useful error messages now.
• Object identity operators === and !==
• The rag cmd line tool code has been cleaned up (no more C constructs, using STL/ C++ std lib now).

The PR language is almost usable now.
Still not happy with implicit string returning syntax. (Most users will not find this readable)