Add new JRebirth module used to manage Undo Redo Commands
Add DefaultApplication class and fix some code
Change default value dor DeveloperMode = False
Explore new ways with wave items
Integrate Showcases Applications
Provide a beta StackModel as a reusable component
Split Pom files in order to factorize top level properties
Merge remote-tracking branch 'origin/master'

Conflicts:
	org.jrebirth/core/src/main/java/org/jrebirth/core/link/NotifierBase.java