Added note.js, contains effect and note data and functions.
Compleeted the amigaEffect function, added try/catch around reading samples incase the file is shorter than expected.
Write amigaEffect, amigaNote, toAmigaNote, toAmigaEffect functions that encode and decode amiga mod data to song data.
Added xm format files.
The webtracker program tests so much better than the test suite, just relying on that now.