Code Generator for Eclipse Code

Improved layout

Improve the generation of reference implementation classes

Refactored the class to use the extension point

Add the source foulder to the extension point

Don't try to add jetemplate if jetemplate is null

Added tests for jetemplate with AST, deserialisation of Jetemplate and generation of Template

Implemented generator retrieving through the new method bundle@... but left the old way because it is still used when generationg through the wizard

Implemented the first test case for HeadlessJavaGenerator succesfully

Added todo to fix a validation error

Implemented the headless generator for java classes