These changes include storing monsters on shutdown, storing dead
characters and monsters, etc. Also fleshed out the MonsterManager's
internals a bit.
(cherry picked from commit af982710f6de050c09ef503cf2f8e1c9fdd34979)
ManagerInterface was already designed for those two anyway. The only thing
left to do is to rewrite the room API, and the whole thing should work
fine again.
I still think map data should be saved and loaded by lua code, so the
rooms will still implement lua hooks. There may be other things that can
be loaded from SQL, but I don't know what.
I'm salvaging the changes to AccountManager and CharacterManager that
don't break the build too badly. This won't build, but it'll be easier to
rectify.
Also, I've reduced the length of the manager's method names, and renamed
sql_utility.*pp to sql_tools.*pp