Removed the dependency from the UI logger
Implemented the first test case for HeadlessJavaGenerator succesfully
added new property
Added test class for HeadlessJavaGenerator
Added new package
Added todo to fix a validation error
Implemented the headless generator for java classes
Implemented tests for HeadlessJavaClassInput
Fixed a bug in the validation of the modifiers (missing return)
Added implemented test for HeadlessJavaGeneratorInput
