AON - Dark UI Overhaul

-Remade (mostly) every texture.

-Added shaders instead of lang files to change text color to white. [From Default Dark Mode Resourcepack]

-Added textures for gamemode changing and changed the hotbar textures.

-Updated License and Credits.txt

-Fixed BYG button texture in the inventory. (white corners)

-Removed Mystical Nature Support

-Updated description