Remove native postprocessing from renderpipeline
Remove stage2 rts from camerarenderer, pointless now, remove parts of postprocess pipeline from it
Remove RenderingPipelinePostprocess
Start removing PostProcessingSystem
Get rid of native PostProcessSystem entirely, current components need reimplementation now
Remove all mentions of stage1/stage2, copy HDR intermediary texture back to SDR if formats are different
Remove legacy tonemap, default those that used it to HableFilmic
Remove Valve's post_process and gaussian blur shader
Remove msaa_resolve tonemap_resolve too, not used
Removed unused stuff from pipeline
Resolve to SDR in correct color space