[audio.cpp] Release 0.6: dots.tts, MiniMax-H3 text2audio (up to 3x realtime), MiniMax-Music3 (preview), and more new audio models. 5+ demos included.

Hi all :) audio.cpp release 0.6 has been out for a little while, so this is more of an update on what landed and what has been improving around it. 0.6 added 5 new model families: dots.tts, NeuTTS-2e, MuScriptor (Music to MIDI), MiniMax-H3, and SenseVoice-Small, bringing audio.cpp to 49 total model