* (AadlBa.g,
   AadlBaParser.java,
   AadlBaVisitor.java):
   - fix property reference syntaxe miss implementation.

* (EnumerationImpl.java):
   - delete obsolete file.
* (declarative.ecore,
   *.java):
   - add a flag to make the difference between a property reference from a property set and property reference from a classifier.
* (.aadl):
   - Update old tests.
   - Create property reference tests.
* (*.java):
   - Fix warnings.
* (aadlba.ecore):
  - sort classes.

* others:
  - Remove obsolete classes.