Revert "Merge branch 'OpenTK' of https://github.com/dex3r/Explicatio into OpenTK"

This reverts commit fa5322cf1adb4247690fe64d2047cf4399e02173, reversing
changes made to bfdbdad06affa23961d90d365b7dfbfbabdfafde.

Conflicts:
	vs/Explicatio/Explicatio.csproj
	vs/Explicatio/Graphics/Shaders/Shader.cs
	vs/Explicatio/Main/GameMain.cs
	vs/Explicatio/Rendering/GlobalRenderer.cs
	vs/Explicatio/Shaders/Chunk2FS.glsl
	vs/Explicatio/Shaders/Chunk2VS.glsl