Mautrix

* Switched message double puppet indicator convention from `"net.maunium.<bridge_type>.puppet": true` to `"fi.mau.double_puppet_source": "<bridge_type>"`.
* Added double puppet indicator to redactions made with `IntentAPI.redact`.

* Changed lack of media encryption dependencies (pycryptodome) to be a fatal error like lack of normal encryption dependencies (olm) are in v0.13.0.
* Added base methods for implementing relay mode in bridges (started by Alejo0290 in 72).

* Formatted all code using [black](https://github.com/psf/black) and [isort](https://github.com/PyCQA/isort).
* Added `power_level_override` parameter to `ClientAPI.create_room`.
* Added default implementations of `delete-portal` and `unbridge` commands for bridges
* Added automatic Olm session recreation if an incoming message fails to decrypt.
* Added automatic key re-requests in bridges if the Megolm session doesn't arrive on time.
* Changed `ClientAPI.send_text` to parse the HTML to generate a plaintext body instead of using the HTML directly when a separate plaintext body is not provided (also affects `send_notice` and `send_emote`).
* Changed lack of encryption dependencies to be a fatal error if encryption is enabled in bridge config.
* Fixed `StoreUpdatingAPI` not updating the local state store when using friendly membership methods like `kick_user`.
* Switched Bridge class to use async_db (asyncpg/aiosqlite) instead of the legacy SQLAlchemy db by default.
* Removed deprecated `ClientAPI.parse_mxid` method (use `ClientAPI.parse_user_id` instead).
* Renamed `ClientAPI.get_room_alias` to `ClientAPI.resolve_room_alias`.

* Added wrapper for [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716)'s `/batch_send` endpoint in `IntentAPI`.
* Added some Matrix request metrics (thanks to jaller94 in 68).
* Added utility method for adding variation selector 16 to emoji strings the same way as Element does (using emojibase data).

* Added support for parsing colors in the HTML parser (`mautrix.util.formatter.MatrixParser`).

* Added autogenerated docs with Sphinx.
* Rendered version available at https://docs.mau.fi/python/latest/ (also version-specific docs at https://docs.mau.fi/python/v0.12.3/).
* Added asyncpg to client state store unit tests.
* Fixed client state store `get_members` being broken on asyncpg (broken in 0.12.2).
* Fixed `get_members_filtered` not taking the `memberships` parameter into account in the memory store.