*Big Update* for file handling (see description)

*NOT YET FULLY FUNCTIONAL*
• Removing Settings file as we'll use the Android provided Settings file
location and format.
• Refactored FileEditor to remove unnecessary functions, and be more
clear in  its use, also to use more Android provided features.
• Updated Undo class.
• Created Settings class.
• Updated Genre enums, and others.
•• The enums are working quite well for consistent handling.
• Started a Scanner type in function FileEditor that will eventually
move into the Scanner class.
• Removed StorageLocal class, as FileEditor will handle all of those
functions.
• A light update of the Song class.