Inlining a subdiagram should resolve entry and exit nodes

[RainerKlute]

Extracting a subdiagram creates entry and exit nodes as needed to implement the semantics of the origin composite state.

Inlining a subdiagram should resolve these nodes and lead to a statechart with minimal complexity.

[RainerKlute]

This might be a duplicate of issue #72.

[terfloth]

No - we can not generally assume that entries and exit nodes should be resolved in general, as using entries and exits in inline substates is possible and also provides some advantages.

So at best it can just be an option for the refactoring and would require another dialog to choose this option.