Revised LameMusic format to facilitate more complex song files, improve readability, allow reuse of patterns across channels, and provide a simple solution to stuck notes after loop completion; new format will also be easier to create an editing interface for.
Renamed piXel songs from sng_* to song_*
Removed dead DropTheBeat demo
Brought all other songs forward to the new LameMusic format.
Fixed weirdness in tank battle song file