Fixes #70. Shows relevant relationships even if neither or the related
classifiers are owned by the package.
Properly update other diagrams when generalizations are created or
deleted.
Use getDescendantShapeByElementName in AadlConnectionInfoProvider. This
more closely matches the other connection information providers and
fixes a problem finding refined subcomponents when the connection was
declared on the unrefined version. Fixes #71.
Added label backgrounds to subcomponent text.
Fixes a null pointer exception in independence provider.
Fixed highlighting end to end flows that included refined elements.