[video_core, settings] Allow to turn of aniso levels completely, provide levels of aniso upto x64 (#3019)

Never in my lifetime will I ever need to revise anisotropy levels; I hope :)

Signed-off-by: lizzie lizzie@eden-emu.dev

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3019
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

docs/user/Graphics.md

@@ -43,6 +43,12 @@ Various graphical filters exist - each of them aimed at a specific target/image
   - **Pros**: Offers decent pixel-art upscaling.
   - **Cons**: Only works for pixel-art.
 
+### Anisotropy values
+
+The anisotropy value is (value game wants + the set value); **Default** will use the native anisotropy value as it would be on hardware. **Automatic** sets it according to screen resolution. Turning off anisotropy is not recommended as it can break a myriad of games, however it is provided in the name of flexibility.
+
+Values from x2, x4, x8, x16, x32 up to x64 values are provided. This should be enough to not need to revise those values in my lifetime ever again.
+
 ### External
 
 While stock shaders offer a basic subset of options for most users, programs such as [ReShade](https://github.com/crosire/reshade) offer a more flexible experience. In addition to that users can also seek out modifications (mods) for enhancing visual experience (60 FPS mods, HDR, etc).