TMC v0.1.6-experimental

Five tracker fixes (#36, #42, #43, #45, #46) + F8 in-game debug menu + F5/F6 quicksave/quickload. See CHANGELOG.md for full notes.

Setup: unpack the tarball, place a USA baserom.gba (SHA-1 b4bd50e4131b027c334547b4524e2dbbd4227130) in the same folder, run the binary. Asset extraction runs automatically on first launch (~30s).