OnShutdown

The OnShutdown event can be implemented by a script add-in to receive notification when Opus is shutting down.

Method Name:	OnShutdown
Argument Type:	ShutdownData
Return Type:	bool
Description:	Opus calls this event when it is shutting down. The ShutdownData.endsession property will be True if Opus is quitting because Windows is shutting down. If endsession is False, you can return True from this event to prevent Opus from quitting - the return value is ignored if Windows is shutting down too.