v1.30: New Dance Generation Algorithm

I've updated the dance pattern generation algorithm significantly. It now will section the song into areas where it prioritizes vocals and beats separately. Before, it mixed vocals and beats together, causing a bit too much chaos that didn't seem to match the music accurately -- especially at higher difficulties. The new system generally makes levels easier to complete (because there is a less "spam"), but should be more fun to play each song longer. Please enjoy! - Phr00t