This enables federation by default

TODO: we need to send pdus if a user of the appservice is in the room
but not the appservice user itself

Also query SRV records when well-known is not found, fixes #29

this also reverts some stateres changes

The latest state-res crate uses ruma's PduRoomV3 PDU's which don't have
tuples of (EventId, EventHashs) like previous versions did (this was
left from rebasing onto master). The Media DB
now takes an optional content_type like the updated ruma structs.

feat: send logs into admin room

See merge request famedly/conduit!6

Log entries will automatically be deduplicated, so a message won't be
sent if the same line has already been sent in the last 30 mins

fix: logging thread crash when admin room does not exist

See merge request famedly/conduit!9

Fix complement

See merge request famedly/conduit!7

Sending improvements

See merge request famedly/conduit!2