From-scratch libraries for teaching: graphics, audio, compression, crypto, networking and more

The libraries under the Playground, written from scratch for teaching, one idea per module, each interface with its diagram, worked example and references: 2D and 3D software rasterizers, image and video formats (PNG, GIF, JPEG, MPEG-1, ...), a software synthesizer and the audio formats (WAV, MIDI, MOD, MP3, ...), compression (Deflate, LZW, ...), cryptography and TLS 1.3, network protocols and netcode, physics, game AI, a GUI toolkit, a terminal. None of them knows the Playground; each is a library of its own, tiny_libs.<name>.