Camera shaders
There was quite some work on camera shaders and related code, so the list of new features is:
- fisheye camera, custom projection camera
- thin lens and fisheye camera variants supporting chromatic aberration (transverse and longitudinal)
- zero-copy access to device buffers wrapped in ndarrays: 8/32bps image, hit and object info, albedo, normals
- configurable denoiser inputs: rgb-only, rgb+albedo, rgb+albedo+normals