Improve ServiceTask to support progress bar and multiple concurrent call
Manage Generic Super Type according to interface instead of index (it
would be more easier to extend all base classes)

+Clean Up
Improve form object usage
(stille require some improvments to manage Standalone FormModel)
Merge remote-tracking branch 'origin/master'

Conflicts:
	org.jrebirth/undoredo/src/main/java/org/jrebirth/undoredo/service/UndoRedoService.java
	
+Clean up