[pull] master from beyond-all-reason:master - #84
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Expose glCopyImageSubData (ARB_copy_image) to Lua. Until now the only way to fill a layer of a GL.TEXTURE_2D_ARRAY, or to combine two textures, was a render-to-texture pass, which forces an uncompressed RGBA8 copy even when the source is a compressed texture and costs a fullscreen draw per layer. A direct image copy keeps the source format (compressed to compressed included) and needs no FBO. The destination must be a Lua-created texture, the source can be any texture name gl.Texture accepts. Offsets and sizes are validated against the known texture dimensions. The function is only registered when the driver supports ARB_copy_image.
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