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Draft: Improve read-back: Formats (2/3)

Loïc Molinari requested to merge molinari/weston:improve_read_back/formats into main

This MR proposes utilities to better handle texture and framebuffer objects handling in the GL renderer and ports existing code to these. It also adds support for more wl_shm RGB and YUV formats in the GL renderer.

Renderbuffer read-back format has been reworked too in order to use the optimal format per output for the OpenGL implementation.

It is the 2nd of a set of MRs trying to improve buffer read-back in the GL renderer.

This is a big MR that could be further split if needed.

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