Scripts: add new commands: blackout:on and blackout:off #998
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Since scripts are executed within locked InputOutputMap.m_UniverseMutex, setting blackout must be postponed until that mutex is released. The convenient place is DumpUniverses(). After scheduling the script loop is interrupted so that the blackout may be actually changed until the next script step is executed. I didn't use QTimer::singleShot since this way the timing is more precise. When blackout state is changed from GUI/VC button, any scheduled change is discarded.
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Since scripts are executed within locked InputOutputMap.m_UniverseMutex,
setting blackout must be postponed until that mutex is released.
The convenient place is DumpUniverses().
After scheduling the script loop is interrupted so that the blackout
may be actually changed until the next script step is executed.
I didn't use QTimer::singleShot since this way the timing is more precise.
When blackout state is changed from GUI/VC button, any scheduled change is discarded.