Header-only third_party image decoding implementations

 * STB: Public domain header-only image loading and manipulation. Find
   Full repo on https://github.com/nothings/stb
   This is from git submit 8b5f1f37b5b75829fc72d38e7b5d4bcbf8a26d55
 * QOI: MIT licensed header-only implementation of https://qoiformat.org/
   Full repo on https://github.com/phoboslab/qoi
   This is from git submit 7039fcd60c4355c5300199c730049cccd8386a34
