We have too much stuff in the top directory, and it's become a mess.
I'm moving all single data files in here--*.dat, *.ini. Some of these are
read-only, some are read-write; I'm not splitting those here, since having
too many tiny directories is also unmanagable. (We can do that in Unix
later without doing it in Windows, though, where R/W files should go
in ~/.StepMania/.)