Mautrix

* *(util.async_db)* Changed aiosqlite connector to force-enable foreign keys,
WAL mode and busy_timeout.
* The values can be changed by manually specifying the same PRAGMAs in the
`init_commands` db arg, e.g. `- PRAGMA foreign_keys = OFF`.
* *(types)* Added workaround to `StateEvent.deserialize` to handle Conduit's
broken `unsigned` fields.
* *(client.state_store)* Fixed `set_power_level` to allow raw dicts the same
way as `set_encryption_info` does (thanks to [bramenn] in [127]).

[bramenn]: https://github.com/bramenn
[127]: https://github.com/mautrix/python/pull/127

* *(crypto.store.asyncpg)* Fixed bug causing `put_group_session` to fail when
trying to log unique key errors.
* *(client)* Added wrapper for `create_room` to update the state store with
initial state and invites (applies to anything extending `StoreUpdatingAPI`,
such as the high-level `Client` and appservice `IntentAPI` classes).

* *(util.formatter)* Added conversion method for `<hr>` tag and defaulted to
converting back to `---`.

* *(appservice)* Added try blocks around [MSC3202] handler functions to log
errors instead of failing the entire transaction. This matches the behavior
of errors in normal appservice event handlers.

* *(client.api)* Added option to pass custom data to `/createRoom` to enable
using custom fields and testing MSCs without changing the library.
* *(client.api)* Updated [MSC3870] support to send file name in upload complete
call.
* *(types)* Changed `set_edit` to clear reply metadata as edits can't change
the reply status.
* *(util.formatter)* Fixed edge case causing negative entity lengths when
splitting entity strings.