Reflect changes to newer gaussian-splatting repo

Add depth and normals to inference notebook

Reintroduce sh_ref_cam parameter

Add FFHQ license to data

Add evaluation script

Rename to GGHEAD_RENDERINGS_PATH

Remove GSM

Initialize neural_rendering_resolution if None

Update default values

Add FID metrics

rename wandb project

Improve documentation

Add train script

Cleanup inference notebook

Cleanup inference notebook