v0.26.0

• (client,appservice) Deprecated SendMassagedStateEvent as SendStateEvent has been able to do the same for a while now.
• (client,federation) Added size limits for responses to make it safer to send requests to untrusted servers.
• (client) Added wrapper for /admin/whois client API (thanks to @nexy7574 in #411).
• (synapseadmin) Added force_purge option to DeleteRoom (thanks to @nexy7574 in #420).
• (statestore) Added saving join rules for rooms.
• (bridgev2) Added optional automatic rollback of room state if bridging the change to the remote network fails.
• (bridgev2) Added management room notices if transient disconnect state doesn't resolve within 3 minutes.
• (bridgev2) Added interface to signal that certain participants couldn't be invited when creating a group.
• (bridgev2) Added select type for user input fields in login.
• (bridgev2) Added interface to let network connector customize personal filtering space.
• (bridgev2/matrix) Added checks to avoid sending error messages in reply to other bots.
• (bridgev2/matrix) Switched to using MSC4169 to send redactions whenever possible.
• (bridgev2/publicmedia) Added support for custom path prefixes, file names, and encrypted files.
• (bridgev2/commands) Added command to resync a single portal.
• (bridgev2/commands) Added create group command.
• (bridgev2/config) Added option to limit maximum number of logins.
• (bridgev2) Changed ghost joining to skip unnecessary invite if portal room is public.
• (bridgev2/disappear) Changed read receipt handling to only start disappearing timers for messages up to the read message (note: may not work in all cases if the read receipt points at an unknown event).
• (event/reply) Changed plaintext reply fallback removal to only happen when an HTML reply fallback is removed successfully.
• (bridgev2/matrix) Fixed unnecessary sleep after registering bot on first run.
• (crypto/goolm) Fixed panic when processing certain malformed Olm messages.
• (federation) Fixed HTTP method for sending transactions (thanks to @nexy7574 in #426).
• (federation) Fixed response body being closed even when using DontReadBody parameter.
• (federation) Fixed validating auth for requests with query params.
• (federation/eventauth) Fixed typo causing restricted joins to not work.