QOI for Allegro

This is a simple liballeg plugin that gives Allegro the ability to decode QOI images, in both 24-bit and 32-bit formats.

Some example images and a test program are provided. All of the code is in allegro_qoi.c. The header file declares only a single function al_init_qoi() which takes no parameters (same thing as al_init_image_addon()). Call it once when your program starts.

If you want you can also just drop the allegro_qoi.c into your project and forward-declare it's init function once where it's used.

This plugin does not handle saving QOI images yet.