Change other item+experience evolutions to just item.

bluuuuuuh apparently I missed these after all BUT this is all of them.
Get rid of __singlename__.

It's a veekun thing and I just assumed it was an SQLA thing eheheh.
Use one .ini for alembic and the rest of the app.

I can't see any reason why it needs to be separate, and it'll be useful
for the impending updater script to require just one config.
Use a CLI to manage the database. #23
Update the README.
Have the CSVs match asbdb's dump command.
Use one merged metadata for alembic autogeneration.
When using alembic via asbdb CLI, only log if -s is specified.
Include global options when setting shit up in __init__.py.