Maubot

* Dropped Python 3.7 support.
* Switched main maubot database to asyncpg/aiosqlite.
* Using the same SQLite database for crypto is now safe again.
* Added support for asyncpg/aiosqlite for plugin databases.
* There are some [basic docs](https://docs.mau.fi/maubot/dev/database/index.html)
and [a simple example](./examples/database) for the new system.
* The old SQLAlchemy system is now deprecated, but will be preserved for
backwards-compatibility until most plugins have updated.
* Started enforcing minimum maubot version in plugins.
* Trying to upload a plugin where the specified version is higher than the
running maubot version will fail.
* Fixed bug where uploading a plugin twice, deleting it and trying to upload
again would fail.
* Updated Docker image to Alpine 3.15.
* Formatted all code using [black](https://github.com/psf/black)
and [isort](https://github.com/PyCQA/isort).

Docker-only release: added automatic moving of plugin databases from
`/data/plugins/*.db` to `/data/dbs`

* Moved plugin databases from `/data/plugins` to `/data/dbs` in the docker image.
* v0.2.0 was missing the automatic migration of databases, it was added in v0.2.1.
* If you were using a custom path, you'll have to mount it at `/data/dbs` or
move the databases yourself.
* Removed support for pickle crypto store and added support for SQLite crypto store.
* **If you were previously using the dangerous pickle store for e2ee, you'll
have to re-login with the bots (which can now be done conveniently with
`mbc auth --update-client`).**
* Added SSO support to `mbc auth`.
* Added support for setting device ID for e2ee using the web interface.
* Added e2ee fingerprint field to the web interface.
* Added `--update-client` flag to store access token inside maubot instead of
returning it in `mbc auth`.
* This will also automatically store the device ID now.
* Updated standalone mode.
* Added e2ee and web server support.
* It's now officially supported and [somewhat documented](https://docs.mau.fi/maubot/usage/standalone.html).
* Replaced `_` with `-` when generating command name from function name.
* Replaced unmaintained PyInquirer dependency with questionary
(thanks to [TinfoilSubmarine] in [139]).
* Updated Docker image to Alpine 3.14.
* Fixed avatar URLs without the `mxc://` prefix appearing like they work in the
frontend, but not actually working when saved.

[TinfoilSubmarine]: https://github.com/TinfoilSubmarine
[139]: https://github.com/maubot/maubot/pull/139

* Added `loader` instance property for plugins to allow reading files within
the plugin archive.
* Added support for reloading `webapp` and `database` meta flags in plugins.
Previously you had to restart maubot instead of just reloading the plugin
when enabling the webapp or database for the first time.
* Added warning log if a plugin uses `web` decorators without enabling the
`webapp` meta flag.
* Updated frontend to latest React and dependency versions.
* Updated Docker image to Alpine 3.13.
* Fixed registering accounts with Synapse shared secret registration.
* Fixed plugins using `get_event` in encrypted rooms.
* Fixed using the `command.new` decorator without specifying a name
(i.e. falling back to the function name).

No changelog.

Initial tagged release.