Merge pull request #49 from ravedragon/master

Completed Issue #29
Fix special spritesets with dollar sign filenames
Remove concept of PersistentStateUtil. Consolidate function into PersistentState.
Add function to add or remove items to PersistentState
Merge branch 'master' of github.com:rpgboss/rpgboss
Merge pull request #9 from rpgboss/master

updated