Fix inherited attribute values in fsm genmodel

This merge request fixes the inherited attribute values set by the fsm genmodel builder.

Note that the change in the TransitionChainGenerator class is necessary such that we do not break existing models: If an actor class inherits a state machine from its base class as is, then previously no graph items were marked as inherited. Now that those items are correctly marked as inherited, the TransitionChainGenerator would have not called entry and exit codes anymore when entering or leaving a state through an entry/exit point.

Fixes #158 (closed)