Generate levels from maps instead of code

[russplaysguitar]

Level files begin with a map of the level, but all elements within the map are generated from the code that follows. Although some things will still need to be done with code, we should be able to generate the location of things from the map itself.

Example map:

 # --------
 #|@      >|
 # --------

(found in: towers/beginner/level_001.rb)