improve SDF tracing (but maybe break transparent/refractive BRDFs for SDFs)

Update generic-array to 0.14 to avoid UB

new scene, small usability improvements to Srgb and sky material

add more documentation, restructure code, remove vek completely

add new volumetric demo render

adjust scene and some sample passing bug fixes

initial volumetrics

update ko-fi username

optimize ray marching especially for low quality renders

Update README.md

Update README.md

Update README.md

change scene

fix warnings

Create FUNDING.yml