Fix many color correction problems with OpenGL ES

On GLES, check for OES_texture_3D extension for color correction

Remove a block of ugly hack code that was supposedly needed to build
with OpenGL ES.

Convert the lookup texture data to uint8 on OpenGL ES before sending it
via glTexImage3D, because uint16 is not supported.

Check if the shaders have been reinitialized successfuly when trying to
activate color correction, prevent black screens when there are issues
with the shaders.


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