Add SceneCamera.RenderToPixmap
Fix "QPainter::begin: Paint device returned engine == 0, type: 1"
Delete SceneWidget
AssetPreviewWidget use SceneCamera
Delete CSceneRenderWidget
SimpleRenderScene - only do SVRT_FORCE_EXACT_DIMENSIONS when returning the texture
Do CToolsRenderScope when rendering scenes from tools
Dump scratch rt's after a number of frames unused
Always allow scrartch rt's
FlushScratchRenderTargets when a swapchain changes size