MP1-4100 : Rework Refresh Changer by rework Win32 API on both C# and C++ side. It fix issue on multi screen setup and also GPU#1 / GPU#2.
MP1-4100 : Enable Win7 Refresh Rate C++ API (it will use double Refresh rate value).
Merge remote-tracking branch 'remotes/upstream/MP1-4100_Rework_Refreshrate_when_using_multi_monitor' into 1.4.0Fork_SEB_New_Master

Conflicts:
	DirectShowFilters/Win7RefreshRateHelper/source/Win7RefreshRateHelper.cpp
	mediaportal/Core/Player/RefreshRateChanger.cs