Improve reshade configuration

[Sporif]

This is an attempt to simplify ReShade configuration while maintaining backwards compatibility. It allows you to specify the shader filename in effects and the path to the reshade-shaders folder in reshadePath (the folder must contain "Shaders" and "Textures" dirs), e.g

effects = Monochrome.fx
reshadePath = /usr/share/reshade

You can specify the shaders with the .fx extension or not. If there's a name conflict in the future the vkBasalt effect will take priority so using .fx is probably better, and it's clearer that it's a ReShade shader.

reshadeIncludePath and reshadeTexturePath are higher priority than reshadePath. I also added reshadeShaderPath for specifying the Shaders dir because its name is more intuitive.

You can still specify the shader with a path i.e

effects = monochrome.fx
monochrome = /usr/share/reshade/Shaders/Monochrome.fx

But If it's a relative path it's added to the shader path.

And finally the settings for ReShade shaders are now specified with the shader name as prefixes (so they don't clash + better readability). e.g

effects = Technicolor
Technicolor_Strength = 1

[DadSchoorse]

I'm not sure that's the right thing to do, ideally vkBasalt should support multiple different reshade shader repos at the same time.

[pchome]

What about support multiple different reshade shader repos by their repo_id?

If specified, just look into ${shared}/${repo_id}/Shaders. If not, ${shared}/crosire/reshade-shaders/Shaders.

https://www.pcgamingwiki.com/wiki/ReShade#List_of_known_shader_repositories

0001-Hack-support-multiple-reshade-repos.patch.gz (draft)

Then I installed multiple different reshade shader repos into /usr/share/reshade and used them in this random mix example config:

depthCapture = on

effects = effect1:effect5:effect7:cas:effect8

effect1 = LUT.fx
#effect1_repo_id = crosire/reshade-shaders

effect5 = FXAA.fx
effect5_repo_id = CeeJayDK/SweetFX

effect7 = Comic.fx
effect7_repo_id = Daodan317081/reshade-shaders

effect8 = ColorIsolation.fx
effect8_repo_id = Daodan317081/reshade-shaders

or maybe something like this would be better, or maybe both variants

...
effect1 = LUT.fx
effect5 = CeeJayDK/SweetFX:FXAA.fx
...