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removed deadlocks in JavaFXUI

Niklas Krieger requested to merge bugfix_deadlock into master

The JavaFXUI is a STA. Calling blocking methods can / does result in a deadlock: the CommandStack wants to execute a Command, but this is not possible because it needs to execute some stuff on the JavaFX thread, which is blocked by a abort/undo/redo/pause/resume request.
Fix: all abort/undo/redo/pause/resume calls are executed on another thread, therefore the UI thread is not blocked.
Additionally, abortOrStopGame is always called because it is possible and prevents concurrency issues

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