C++: Always Increment Run Sequence when Leaving Global RUN State

This adds a new signal to the Controller class which notifies about leaving a state. In principle this could also be added as two more parameters to the reached_state method, but I felt it was cleaner like this.

The new method is used to increment the run sequence whenever a global RUN state is left, so not only when clicking the sotp button but also in case of failure or interruption.

This closes #198 (closed)