Add initial logic for playing world music when loading save state from world map (does not work yet).
Make it play world/level music based on save state file when game is loaded.
merge release K&R formatting changes into world music fixes
Merge pull request #187 from datahead8888/worldMusicFix

World music save state loading fix.  Fixes #174
Merge remote-tracking branch 'origin/devel' into release-2.0.0
Merge branch 'release-2.0.0' into devel