architectural contexts and viewpoints
Replaced the viewpoint configuration framework by a new architectural
context/viewpoint framework. This involves defining architecture
contexts and viewpoints in models and contributing them via extension
points or via the preferences. Models reference an architecture context
and a set of viewpoints at creation time, but can be switched later.
Architecture contexts double as client contexts for which
elementtypesetconfigurations can be registered. They also define
viewpoints, which reference representation kinds (diagrams or tables).
This contribution defines three architecture contexts: UML, Profile, and
SysML corresponding to what Papyrus used to call diagram categories.
Signed-off-by: Maged Elaasar <firstname.lastname@example.org>