Implement HeatmapOverlay
Split up GPUHelper into GPUSurfacePainter, GPUSurfaceShader and GPUSurfaceCompactor. Adds class VertexAttribute
Merge master into OverlayOrca
Implement VertexAttribute and fix GPUSurface* classes
Add reset method to VertexAttribute
Implement MacroblockOverlay
Add MacroblockOverlay test cases
Merge master into the (kind of)BeautyQueen