All this crap is very brittle due to circular deps and python handling
them badly. This appears to be fixing some stuff, at the very least.

This is sed, so cleanup of imports (which can now be grouped together)
is not done yet.

Instead of chat tabs, which include MUC which doesn’t implement that.

broken since bc6ee8da due to using timestamps

(even if we thought we were already disconnected)

(broken during linkmauve refactoring)

It’s needed for proper installation

This commit is non-functional, it only changes indentation to make
other changes more apparent, I’m sorry if you come from the future and
are bisecting, it was the only way to make it look proper. :(

Also don’t handle logger fds outside of Logger, and mark private
objects and methods.

Also remove support for OLD_PYTHON (before 3.3), some unused constants,
mark private functions with a leading underscore, and clean up some
pep8 violations.

Status and Command are now slotted classes instead of namedtuples,
which led to a few changes to access them with their named parameters
instead of as a tuple.

“short” being a C type, I renamed Command.short into
Command.short_desc, which is more explicit anyway.

I also renamed possible_show into POSSIBLE_SHOW, as it is a
module-level constant dict.