beyond_the_skybox shader patches

All this mod does so far is fix the fog rendering issues with Sildur's Enhanced Default Shaders.

This is literally my first published mod! I plan to build upon it in the future.

Potential Idea: Maybe I can make it where the shaders change per dimension for Beyond The Skybox? For example for the Minecraft tutorial dimension I could make it where it switches to the Legacy Console Edition Shaders? idk, I'm just thinking.

Created with the help of GLM 5.2 for the fog fix while I learn Java modding. Tested and confirmed working in-game. :)