Add some basic structure for parsing command line options and saving/resuming a game.
Make the initial debug statement use the DEBUG() function.
CMD_{SAVE/LOAD/QUIT} and some comment/spacing/spelling fixes.
OS interface helper file.
ASCII and Unicode trees.
src/lib/views => src/lib/components, reclassify some modules, and adjust module imports.
Add a script to purge saved games and .pyc files.