- Added method to Fog to set the uniform variables in the shader
(locations are passed in)
- Added Fog field to the Renderer
- Moved Fog from World to Renderer
- Shader implementation of linear fogging
- Added flag in the fragment shader for turning fog on/off
- Added methods in Fog.java to update uniforms
- Working implementation of linear fogging
- Uniform variables are initialized now in the Renderer constructor (may
be moved in the future)