[cleanup] Remove unused GenModel annotations

Change-Id: I02311c581e51da8087e119f217a7b887440f8c76
[419926] Cancel wrong rebrandings

Cancel Viewpoint Specification model and project rebranding
Rename several 'Siriuss' into 'Viewpoints'
Entries found in doc, icon files name, properties, wizards, ...

Change-Id: I4e33db05d27b2821162fa31efed44da06fabfee7