Multiple timeline rooms

[elemental-software]

It would be useful to have at least two different timeline rooms, one that shows the entire feed with followings, another to show only tweets and mentions. Alternatively a bridged room that also shows @mentions would be fine.

My use case is a team that has a shared twitter account for general announcements that also follows a number of users. This would allow team members to browse the entire feed from within a matrix client (and without having to follow everyone the shared account does), but also have a separate room that has notifications turned on, so team members can be notified when the shared account tweets or when it gets @mentions.

(If we could set room notifications to trigger notifications on arbitrary keywords I wouldn't need this).