v0.18.0

• Breaking change (client, bridge, appservice) Dropped support for maulogger. Only zerolog loggers are now provided by default.
• (bridge) Fixed upload size limit not having a default if the server returned no value.
• (synapseadmin) Added wrappers for some room and user admin APIs. (thanks to @grvn-ht in #181).
• (crypto/verificationhelper) Fixed bugs.
• (crypto) Fixed key backup uploading doing too much base64.
• (crypto) Changed EncryptMegolmEvent to return an error if persisting the megolm session fails. This ensures that database errors won't cause messages to be sent with duplicate indexes.
• (crypto) Changed GetOrRequestSecret to use a callback instead of returning the value directly. This allows validating the value in order to ignore invalid secrets.
• (id) Added ParseCommonIdentifier function to parse any Matrix identifier in the Common Identifier Format.
• (federation) Added simple key server that passes the federation tester.