* Created a Serializer class. Serializes and Deserializes any object.

* Refactored the GameSave class.  Now uses the serializer class.
* Deleted the GameSaveXML writer class, the Inventory class, and Party class. They are no longer needed.
* Created the Music class for storing music info.
* Created the MusicJukeBox class for storing list of songs.
* Refactored RpgGame class. Removed all references to deleted classes.