- Prevent pollution of AnnotationEntry <-> IModelElement cache via...

- Prevent pollution of AnnotationEntry <-> IModelElement cache via instantiateAnnotations(final IModelElement element) (which might be invoked from model transformations). I.e., the cache is only updated, when the AnnotationEntries are queried from the GUI context.
- In case further measures need to be taken to limit the size of the AnnotationEntry <-> IModelElement cache, <http://stackoverflow.com/questions/2941283/java-fixed-memory-map> might be a good starting point