kool 0.13.0 release

Highlights:

Compute shaders! (part 1 of 2: for now only storage images are supported, support for SSBOs is still missing)
Common GL render backend for desktop OpenGL and browser WebGL: (almost) no more duplicated code and a lot easier to maintain
Rewrote a lot of math code (transform matrices, etc.): More consistent API between type variants, (hopefulle) easier-to-use API
Zero-to-one depth and support for reversed depth on OpenGL 4.5+ for much higher depth precision

Available on maven central and via the template projects