Keep track of all prev_events since if we know that an event is a
prev_event it is referenced and does not qualify as a forward extremity.

All state snapshots that are used in the resolve call are state after
snapshots, they have the event inserted.

Tokio seems a bit broken with Rocket...

Ruma updated the event signing validation code and there was a dep
resolving failure with serde rocket and tokio so I updated rocket latest and
tokio 1.0 to fix.

Fixed the miss named commented out keys in conduit-example.toml.

This also bumps ruma to latest and removes js_int infavor of the ruma
re-export

Sync are-we-synapse with dendrite

See merge request famedly/conduit!21

Add 'm.login.token' authentication

See merge request famedly/conduit!5

Handle optional device_id field during login

See merge request famedly/conduit!16

Appservices

Closes #29

See merge request famedly/conduit!11

Complement Testing: Fix binary name typo

See merge request famedly/conduit!20

Update repository link in crate metadata

See merge request famedly/conduit!19