Implemented wxD2DContext::Translate, wxD2DContext::Scale and wxD2DContext::Rotate
Reimplemented wxD2DOffsetHelper to use the wxGraphicsContext::Translate method
Implemented linear gradient brushes
Added a D2DGradientStopsHelper to help with the conversion between wxGraphicsGradientStops and ID2D1GradientStopCollection and to safely release the acquired resources
Updated wxD2DBrushData::AcquireLinearGradientBrush to use the D2DGradientStopsHelper class
Implemented radial gradient brushes