Add FidelityFX Super Resolution 2.2 (FSR 2.2.1) support.

Introduces support for FSR2 as a new upscaler option available from the project settings. Also introduces an specific render list for surfaces that require motion and the ability to derive motion vectors from depth buffer and camera motion.

thirdparty/README.md

@@ -17,6 +17,21 @@ Files extracted from upstream source:
 - `license.txt`
 
 
+## amd-fsr2
+
+- Upstream: https://github.com/GPUOpen-Effects/FidelityFX-FSR2
+- Version: 2.2.1 (1680d1edd5c034f88ebbbb793d8b88f8842cf804, 2023)
+- License: MIT
+
+Files extracted from upstream source:
+
+- `ffx_*.cpp` and `ffx_*.h` from `src/ffx-fsr2-api`
+- `shaders` folder from `src/ffx-fsr2-api` with `ffx_*.hlsl` files excluded
+- `LICENSE.txt`
+
+Apply `patches` to add the new options required by Godot and general compilation fixes.
+
+
 ## angle
 
 - Upstream: https://chromium.googlesource.com/angle/angle/