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

Merge pull request 'Frequent flushing, configurable cache capacity, welcome message' (#237) from small-improvements into master

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/237

Merge pull request 'improvement: correct thumbnailing algorithm' (#233) from fix-thumbnailing into master

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/233

Merge pull request 'Fix order of docker command arguments' (#232) from Weasy666/conduit:master into master

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/232


Reviewed-by: Timo Kösters <timo@koesters.xyz>

...github.com repo, to relieve some pressure from git.koesters.xyz.

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/231

TIL body.device_id != (*body).device_id, which is pretty bad, so I
renamed body.device_id to body.sender_device

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/195

Merge pull request 'Allow unjoined users to read state of world readable rooms' (#230) from allow-reading-state into master

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/230

See https://matrix.org/docs/spec/client_server/r0.6.1#id87

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/229

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/226

Merge pull request 'fix: random timeline reloads' (#227) from fix-random-timeline-reloads into master

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/227

Reviewed-on: https://git.koesters.xyz/timo/conduit/pulls/225