MP1-4420 : PowerBroadcast messages are handled by a thread to allow delay on resume
Merge remote-tracking branch 'remotes/upstream/MP1-4420-BUG-Startup_resume_not_used_correctly_fix_multiple_POWERBROADCAST' into 1.7.0Fork-BDJ

Conflicts:
	mediaportal/MediaPortal.Application/MediaPortal.cs