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- Add Id, version, and ConQAT tags to XML files

* Mainly documentation cleanup
* Remove some commented out code

org.fortiss.tooling.kernel.internal.storage.eclipse.ModelContext:
org.fortiss.tooling.kernel.utils.EMFResourceUtils:
 - Resolve B.19 issue (numbering scheme as of Aug. 14, <https://af3-developer.fortiss.org/projects/autofocus3/wiki/Check-list_for_Code_Reviews/56>) "Use static imports"
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- Instead, ensure that DiagramEditorBase has the focus when a child edit part is added or removed
- This works around #2207 and also the same part of #1491 as with the old workaround
- Summing up:
   - Undo/redo of operations on the model only works if either the NavigatorViewPart or a DiagramEditorBase has the focus
   - This makes sense if the active view provides editable items itself (e.g., the GenericAnnotationView) *and* provides undo/redo (currently not the case for GenericAnnotationView).
   - For other (read-only) view (e.g., Model Markers), this behavior is confusing for the user
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