Some GraphicsAdapter cleanup.
Cleanup and documentation pass.
Added GraphicsAdapter.UseReferenceDevice.
Support GraphicsAdapter.UseReferenceDevice in DirectX desktop and WinStore.
Enabled GraphicsProfile.HiDef and GraphicsAdapter.UseReferenceDevice for all visual tests by default.
Merge branch 'develop' into testfix
Removed now unnessasary GraphicsProfile.HiDef.
Merge pull request #2884 from SickheadGames/testfix

Support UseReferenceDevice For Unit Tests