Cloud Layers

- Ported to Neoforge
- Each cloud layer can use different textures.
  - In the default configuration, the lower layer uses the new 1.21.6 + cloud texture, as it more resembles cumulus clouds.
- Config menu changes
  - "Color" option for cloud layers.
  - "Texture" option to select the new or old cloud texture, or make the layer fully overcast.
  - "Time start" and "Time end" lets you set the time of day the layer shows up.
  - Renamed "Relative Height" to "Skybox Mode".
- Custom cloud layers can now be configured using resourcepacks.
  - This allows for much more control than a config menu.
  - You can set "thickness" to use a texture, so thickness can vary across a single layer. This feature will be expanded to more options in the future, for making complex cloud / weather systems.