Now plays exactly the same as the original engines.
Notable changes:
- Switch to Audio::Paula from Player_MOD (which predated Paula).
- Music engine now works differently between Indy3 and Loom with regards
to the handling of overlapping notes and limited sound channels.
- Music (and some sound effects) now play in stereo.
- Music now overrides sound effects, as in the original games.
Rename "player" directory to "players", and reintroduce the "player_"
file prefix. This has been done after sev's request.
"players/player_foo.*" is more descriptive, and avoids potential name
clashes in libraries