Added disk display and format command
Added disk drive files and some commands

Added commands: format and create
Produces a message when the user attempts to create a duplicate file
Added write command. Almost fully functional.
Write is now fully functional.
Delete works, but it's kinda' funky.
Implemented read and fixed delete. Hurrah!
List ALL the files!!
Fourth program can be loaded onto disk.
Changed disk drive view max-height