MessageDispatcher, sleepy mode, warnings, and the latency command,
to be exact. Sleepy also benefits from some code deduplication in
addition to now operating on users.
The warnings code could use a more comprehensive overhaul too, but
that's going to be harder to achieve.
This gets rid of the (dced) hack, with var.DCED_LOSERS taking its place.
Succubus was not touched, as there is already a PR which converts it,
although the succubus events in other files were touched.
Some sites were updated to be (more) Users-aware, while others replaced
it with an old deprecated get_roles() API. As more things get converted,
these will hopefully get eliminated as well. A FIXME comment was added
to all such occurrences.
