Rewrote DISPLAY-MESSAGE-IN-MINIBUFFER (ex DISPLAY-MESSAGE)
Implemented function to prompt user for input

Currently it can only process one letter at a time
but I'm going to make another function to prompt strings
Added simple PROMPT-INPUT demo to initialization
Implemented DELETE-WINDOW which deletes window by it's ID
Refactored some graphics code
Implemented brand new drawing system: drawing queue
Now player sees message if something is lying on the floor