Cooldown Limit Fix

Fixes a bug in cooldown limits that was limiting it to either 1 or infinite, regardless of what you put in settings

Moved number of chords setting into Track Filter for per-song. The one in Settings just defines your default number of chords. Note that values under 2 are ignored; like old lutebot transposition, you always have 2 notes per chord. Many songs can and should be bumped up to 3 notes per chord, but some may slow down or sound worse.