Improve Action Task Locking Strategy in ActionImpl to avoid Deadlocks in longterm.

[DivineThreepwood]

The order of locking the action description builder lock and the action task lock is sensitive and causes quickly deadlocks.
Lets investigate any code strategy to avoid such issue in longterm.
In PR #89 we already discussed a good solution that should be implemented once the action Impl has been transformed into kotlin code.