Volumetric clouds as actual volumes

- New component type
- Transformation
- Settings per volume
- Culling
- Low resolution rendering + blending
- Render atmosphere separately 
  - Change atmosphere shader to a simpler one (https://github.com/diharaw/volumetric-clouds/tree/main/src/shader)
- Single SSBO containg information about volumes
- Single dispatch that loops through ssbo and renders volumes
- Signed distance field volumes