GPULightmass CPU fallback

Dear EPIC please add possibility to use GPULightmass with CPU in future as it is much more accurate and way less leaks, i better see noise than leaks and it should be possible to use with CPU like Blender Cycles that renders with CPU really fast. It could give ability to bake with GPU+CPU too like Cycles can. There are lot of benefits adding CPU support and that way old Lightmass could be deprecated, but CPU support is always needed now and even in far far future.

+1 Miners are destroying GPU future and soon people might start to fall back into non raytraced GPU-s or very weak GPU-s where CPU is better than GPU raytracing.