`shader_uniform` is now consistenly used across both per-shader
and per-instance shader uniform methods. This makes methods easier
to find in the class reference when looking for them.
- Increase the default non-volumetric fog density to 0.01 to make
adjustments more visible.
- Use a less saturated non-volumetric fog color by default
(a mix of the sky and horizon colors of the new default
ProceduralSkyMaterial).
- Set Volumetric Fog Gi Inject to 1.0 by default. Injecting GI results
in more realistic appearance of volumetric fog, at a very low
performance cost.
* Moved preprocessor to Shader and ShaderInclude
* Clean up RenderingServer side
* Preprocessor is separate from parser now, but it emits tokens with include location hints.
* Improved ShaderEditor validation code
* Added include file code completion
* Added notification for all files affected by a broken include.
