MP1-4100 : Rework Refresh Changer by rework Win32 API on C# and Win7 API on C++ side. It fix issue on multi screen setup and also GPU#1 / GPU#2.
Merge remote-tracking branch 'remotes/upstream/MP1-4100_Rework_Refreshrate_for_multi_monitor' into 1.4.0Fork_SEB_New_Master

Conflicts:
	mediaportal/Core/Player/RefreshRateChanger.cs
	mediaportal/MediaPortal.Application/MediaPortal.cs