Add the contents of disk 1

- LHA -lh5/-lh6/-lh7 decoding with CRC checks (disk 1 is mostly lh5)
- Real track palettes and set names, read from each track file's header
- Camaro, plus the caravan as a towable trailer (Caravans option)
- Drivers' names, menu pictures and the original .set values per car
- Original sound effects (IFF 8SVX) through a new sample mixer: engine
  pitched with revs, tyre screech, crashes, backfire, horn, start beeps
- The original tune (OctaMED MMD1) through a new player; loudness tracks
  OpenMPT's render through the whole song. Music option in the menu
- Title picture (IFF ILBM) at the top of the menu
- skids unpack and skids music commands
- Gate crossings now judged on each car's whole movement per frame,
  including collision knocks; stalled computer cars are put back on the
  line after 8 seconds

The executable's game logic (handling, AI) is still not decoded.

assets/tracks/track1-5/track.txt

@@ -32,6 +32,9 @@ gate 381.40625 687.25 449.78125 749.875
 gate 472.28125 690.78125 551.53125 741.53125
 gate 468.5625 611.34375 549.5625 610.34375
 
+# Name of the set of tracks this one belongs to, shown in the menu.
+set Racing In The Name Of
+
 # As stored in the original data; not used by the game.
 start 301 79
 flags 0