QOI encoder & decoder in Jai

Just clone this repo as is into your system's modules folder.
Then import this module with #import "qoi";, remember to build your app passing -import_dir <your_modules_dir> to the jai compiler and you're good to go.

You can build the included command line tool using
> jai build.jai
or simply run build.bat at the root of the project in Windows.
This will create the command line application qoi.exe (or equivalent for your OS) in the bin/ folder.

This tool can convert between the QOI format and any of the formats supported by stb_image_write (PNG/BMP/TGA/JPEG).
Simply place the executable in any directory that's in your system's path and run
> qoi <src_file> <dst_file>
using the appropriate file extensions for each desired format.