Fix draw/read buffer selection for framebuffers (FrameBuffer.setTargetIndex(int)) #1786
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This is an issue in the way glDrawBuffer/glReadBuffer are used in the engine: the state is cached as if it was a global state change, while they actually change the current bound framebuffer's state .
The issue prevents FrameBuffer.setTargetIndex(int) from working correctly in some circumstances.
I am leaving this open for a while to make sure this patch doesn't have any weird side effect before merging it.