Changes in synapse v0.30.0 (2018-05-24)

'Server Notices' are a new feature introduced in Synapse 0.30. They provide a
channel whereby server administrators can send messages to users on the server.

They are used as part of communication of the server policies (see ``docs/consent_tracking.md``),
however the intention is that they may also find a use for features such
as "Message of the day".

This feature is specific to Synapse, but uses standard Matrix communication mechanisms,
so should work with any Matrix client. For more details see ``docs/server_notices.md``

Further Server Notices/Consent Tracking Support:

* Allow overriding the server_notices user's avatar (#3273)
* Use the localpart in the consent uri (#3272)
* Support for putting %(consent_uri)s in messages (#3271)
* Block attempts to send server notices to remote users (#3270)
* Docs on consent bits (#3268)
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