Add boss status to generic rendering
Change heart loot

- Heart Containers now drop from dungeon bosses (for dungeons with real
bosses)
- Boss dungeon chests now only contain a heart piece
Song fixes

- Fixed crash from packet code in wrong place... derp.
- Fixed horse not 'appearing' immediately for clients
- Dismount before teleporting
- Added success sound when song effect successful
Added 3 song files