Property sets and packages cannot be contributed in standalone mode

[lwrage]

AADL model units are currently contributed via an extension point. We need a registry that can be populated programmatically to operate in standalone mode.
child of #1538

[Etienne13]

FYI, you can do standalone application using the current mechanism (via extension point) if your standalone application is an osgi application (this is what we did to do non regression tests in RAMSES)

[lwrage]

@Etienne13 Do you have any documentation that shows how to create such an osgi application?