* Cross-signing groundwork
* Update to matrix-org/gomatrixserverlib#274
* Fix gobind builds, which stops unit tests in CI from yelling
* Some changes from review comments
* Fix build by passing in UIA
* Update to matrix-org/gomatrixserverlib@bec8d22
* Process master/self-signing keys from devices call
* nolint
* Enum-ify the key type in the database
* Process self-signing key too
* Fix sanity check in device list updater
* Fix check
* Fix sytest, hopefully
* Fix build
* Implement /_synapse/admin/v1/register
This is implemented identically to Synapse, so scripts which work
with Synapse should work with Dendrite.
```
Test 27 POST /_synapse/admin/v1/register with shared secret... OK
Test 28 POST /_synapse/admin/v1/register admin with shared secret... OK
Test 29 POST /_synapse/admin/v1/register with shared secret downcases capitals... OK
Test 30 POST /_synapse/admin/v1/register with shared secret disallows symbols... OK
```
Sytest however has `implementation_specific => "synapse"` which stops these
tests from running.
* Add missing muxes to gobind
* Linting
* Initial work oon multipersonality binary
* Remove old binaries
* Monolith and polylith binaries
* Better logging
* dendrite-poly-multi
* Fix path
* Copyright notices etc
* Tweaks
* Update Docker, INSTALL.md
* Take first argument if flags package doesn't find any args
* Postgres 9.6 or later, fix some more Docker stuff
* Don't create unnecessary e2ekey DB
* Run go mod tidy
