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Add support for zero-copy rendering to ``AVQt::OpenGLRenderer``

The OpenGL renderer copies frames from GPU to RAM and uploads them back to GPU as OpenGL texture. DXVA2, VAAPI and probably VDPAU (Linux; NVIDIA and AMD) and VideoToolbox (Apple) support direct mapping of video surfaces to OpenGL textures.

This increases energy efficiency a lot, because frames aren't copied between CPU and GPU, but stay in VRAM.

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