Sept 23 - Music, UI, troubles

Features added

• Music music music!  After a LONG time of searching, have menu and actual game music!
• Music system where it switches tracks depending on which scene you're in, and will keep the song playing if it's supposed to keep the same song going
• Added... then lost?... UI updating how many enemies you have to destroy
• Phase # added to UI
• Lowered durability of structures

Confusion added

• UI now doesn't show the number of enemies destroyed... but it used to??