PythonQt Code

updated old license information and current date

- added support for deriving CPP classes in Python and to override all public and protected virtual functions from PythonQt
- changed signal receiver code so that it can be reused for virtual method dispatch
- moved decorators completely into PythonQtClassInfo
- changed python to qt conversion so that it can work with an already allocated object (needed for return values of virtual functions
- added support for multiple inheritance and upcasting (e.g. a QWidget is automatically casted to a QPaintDevice when passed to QPainter.begin())
- removed default constructors of std decorators because they are now codegenerated
- regenerated bindings

- improved the code generator to suppot

- wrapped instances are now wrapped by class specific subtypes to facilitate future deriving from python
- object creation has changed by using the python type system (calling the type object with PyObject_Call)

renamed guards

code cleanup and rename of PythonQtWrapper to PythonQtInstanceWrapper and PythonQtMetaObjectWrapper to PythonQtClassWrapper, since these names match much better what these classes wrap, regarding that we are wrapping CPP objects as well