Commented out methods/accessors that were purely stubs.
Replaced incorrect usages of NotImplementedException with ArgumentException and NotSupportedException.
Implemented GraphicsDeviceManager.BeginDraw/EndDraw().
Implemented DisplayModeCollection.GetEnumerator().
Removed unnessasary DisplayModeCollection.GetHashCode() override.
Implemented EffectParameter.GetValueMatrixArray().
Implemented EffectParameter.GetValueTextureCube().
Implemented EffectParameter.SetValue(Quaternion).
Implemented EffectParameter.GetValueQuaternion().
Implemented AudioCategory.Equals() and associated equality methods.
Implemented AutioCategory.ToString().
Merge branch 'develop' into nie
Commented more methods in NetworkSession that were purely stubs.
Fixed missing using statement.
Commented out more stub methods.
Merge pull request #1985 from SickheadGames/nie

NotImplementedException Cleanup