[vulkan, android] Add feature of post-processing shaders on Android (#4348)

Very self-explanatory; implementation of the feature for post-processing shaders for Android (at least for now); will allow users to enhance the graphic quality of video games based on the use of multiple shaders adjustable, presets and more, inspired on the PPSSPP implementation, this feature adds 22 customizable shaders (1 pass) that lives on the overlay of the screen, which means that aside of the capability to chain multiple shaders on the screen, this doesn't have depths (pixel/ depth z-buffer) so it ensures the performance with it's use. Few shaders were a faithful port from PPSSPP with their respective attribution on the shader headers for their respective owners; and there are adaptations from public references/ cinematographic (Anime4K) and the rest are my own addition.

_Special Credits:_

1.- PPSSPP Team for their contribution on the public references for shaders: Henrik Rydgard, ShadX, SimoneT, KillaMaaki and guest(r).
2.- Niklas Haas.
3.- bloc97.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4348
Reviewed-by: lizzie <lizzie@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

dist/post_presets/Anime.fxp

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+name=Anime
+description=Cel shaded look: the picture is cleaned first, then the lighting is collapsed into flat bands with inked edges, finished with a small glow.
+chain=Denoise.fx|Denoise|Strength=0.18,Radius=1.2;CelShading.fx|CelShading|Bands=5,BandContrast=0.35,BandEdge=0.2,Detail=0.7,OutlineStrength=0.7,OutlineThreshold=0.2,Saturation=1.3;Bloom.fx|Bloom|Radius=1.2,Amount=0.25

dist/post_presets/Cinematic.fxp

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+name=Cinematic
+description=Film look: soft glow on the highlights, a filmic contrast curve, cool shadows against warm highlights, fine grain and a gentle vignette.
+chain=Bloom.fx|Bloom|Radius=1.6,Amount=0.35;FilmicCurve.fx|FilmicCurve|Toe=1.35,Shoulder=1.3,Amount=0.85;SplitToning.fx|SplitToning|ShadowHue=210,ShadowStrength=0.25,HighlightHue=38,HighlightStrength=0.3;FilmGrain.fx|FilmGrain|Intensity=0.022;Vignette.fx|Vignette|Strength=0.5

dist/post_presets/Clean.fxp

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+name=Clean
+description=Cleans up a low internal resolution: removes dithering and compression noise, smooths banded skies and brings edge detail back. The safe starting point if you are not sure what you want.
+chain=Denoise.fx|Denoise|Strength=0.14,Curve=1.2;Deband.fx|Deband|;Sharpen.fx|Sharpen|Amount=0.75

dist/post_presets/Dreamy.fxp

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+name=Dreamy
+description=Soft focus: the centre of the screen stays sharp while everything around it blurs, with a wide glow over the highlights. Good for slower games and cutscenes.
+chain=Blur.fx|Blur|Radius=6,Strength=0.85,FocusSize=0.28,FocusSoftness=0.5;Bloom.fx|Bloom|Radius=2.0,Amount=0.55

dist/post_presets/Retro.fxp

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+name=Retro
+description=Old television look: colour fringing at the edges of the screen, curved scanlines with a phosphor mask, and darkened corners. The scanline roll is switched off so it does not crawl.
+chain=ChromaticAberration.fx|ChromaticAberration|Strength=1.0;CRT.fx|CRT|RollSpeed=0,Bleed=1.2;Vignette.fx|Vignette|Strength=0.7

dist/post_presets/Vivid.fxp

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+name=Vivid
+description=Punchier colour without stylising the image: warmer and more saturated, blacks and whites pushed to the ends of the range, and a light sharpen.
+chain=NaturalColors.fx|NaturalColors|Luma=1.15,Chroma=1.35;Levels.fx|Levels|InputBlack=0.02,InputWhite=0.98;Sharpen.fx|Sharpen|Amount=0.5