Previously notices could only be displayed as HTML. This commit makes it
possible to request a list of notices as JSON. This can be used to
programmatically display a description of a room server in SSB clients.
The behaviour is governed by a query parameter. To list notices as JSON
set a query parameter "encoding" to "JSON" when listing notices (for
example https://example.com/notice/list?encoding=json). This parameter
was chosen instead of using the "Accept" header as similar behaviour is
already exhibited by other endpoints (namely the invite mechanism).
* fix test compilation
* fix aliases on member page
* add tests for aliases on member.GetByID and ByFeed
* fix admin tests
* use webassert helper for flash messages
* fix flashes
Notices are pages that admins can fill with their content to describe
and customize the room.
Pinned notices are common notices that each room has. Like a description
and privacy policy.
* update models
* simple crud test for basic notices
* edit and save notices as admin