* added the banned room proxy
and a way to have a consistent loading + a retry alert
* trailing closure
* indent a comment
* push package.resolved
* updated test case
* improved implementation of the unknown state
* forget button in the banned state
* error handling for forbidden access
* added the forget function
fixed DMs, and updated preview tests
* removed banned room proxy
* code polishing and test improvement
- expose the full RoomPreview and RoomMembershipDetails through their own proxies
- implement standard mocks for all the different combinations
- converge on a single room info provider
- rebuild all the previews
- prioritise the preview data over the room one.