v0.2.0

Added

• Builds for Linux (also the Steam Deck), Windows 7 and later, Windows 95
  and 98, MS-DOS, web browsers, the PlayStation Portable, the PlayStation
  Vita, and iOS and iPadOS. Each has its notes in platforms/<name>/.
  The Vita and iOS builds compile but have not run yet.
• make dist packages every platform whose toolchain is installed as
  dist/aitd-<platform>-<version>.zip, and a GitHub workflow builds all
  of them on each push and publishes a release for each v tag.
• Time Gate music on hosts without a system MIDI synthesizer, played with
  TinySoundFont from a General MIDI soundfont (.sf2) that you provide.
  AITD_SOUNDFONT names the file; otherwise the engine looks in the data
  folder and the usual system folders.
• One gamepad layout for every platform: the D-pad or left stick walks,
  A does the action, X opens the inventory, B and Start go back, Y opens
  the map, and L and R step through the actions.
• Ripped CD tracks can be WAV files (track02.wav) on every platform.
• aitd.env in the program's folder sets AITD_* variables on hosts
  without an environment (the consoles). AITD_NO_SOUND and
  AITD_NO_CD do what -s and -c do.
• VERSION file, this changelog and aitd --version.

Changed

• The program is now called aitd instead of aitd3.
• The engine no longer needs zlib. Its own inflate decodes PAK method 4
  and gives the same bytes as zlib on every entry of the six games.
• CD audio streams from the disc image or the WAV file instead of loading
  whole tracks, which took up to 80 MB.
• The AdLib synthesizer runs in single precision with tables, fast enough
  for the PSP. Its output correlates 0.9991 with the previous version.
• The platform layer is split into shared code (src/platforms/common.c,
  mixer.c) and one small backend per host. src/platforms/backend.h
  lists what a new host needs. The source list is in sources.mk.