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Draft: Improve read-back: Common read-back API and optimisation (4/4)

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

This MR proposes to unify read-back in the GL renderer for output capture, renderbuffer to buffer and renderer's read_pixels() using a common subsystem handling synchronous and asynchronous code paths. It also ensures that the GL renderer uses the best read-back formats as advertised by the graphics driver for optimal performance.

Edited by Loïc Molinari

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