Plus a number of other tidyups:
* Fix /join to dispatch a view_room for the room alias
with the additional auto_join parameter
* Make RoomView automatically join the room if the auto_join
parameter is true and the user isn't already in it
* Tidy up RoomView's peeking code, also fixing
https://github.com/vector-im/vector-web/issues/1220
in react-sdk (although it still requires a synapse change
to actually fix, but react-sdk does 'the right thing').
* Remove duplication of usage text from /join command
* Amalgamate MatrixChat::_viewRoom's many, many parameters
into an object and sort out case consistency a little.
Add a callback to RoomView that it can give the room ID to once it's resolved it, since this lookup is now the responsibility of the roomview and only the roomview. The view_room action now has either an alias or an ID, not both. Also fix RoomView to load the room properly and not try to peek when it shouldn't.
Sorts out more of the room joining mess. currentRoom which held the room ID is now more appropriately called currentRoomId. RoomView will now take a roomID or alias as before but will now look up the room ID as required if given the alias. Also, now look up the alias every time you click on it so it's never stale, rather than looking in your current rooms for a room that thinks it has that ID.
This hopefully fixes an issue where joining a federated room via the directory
would get stuck at a spinner of doom, due to us not recognising the room in
question when it came down the /sync. We now catch the room id in the response
from the /join, and use it to match up the room in onRoom.
props.roomAlias, props.roomId, and state.room.roomId were somewhat confusing,
so I've tried to rationalise them:
* props.roomAlias (named thus to stop you assuming it's a room id) is the
thing that the parent component uses to identify the room of interest, and
can be either an ID or an alias (ie, it replaces props.roomId and
props.roomAlias)
* Everything that needs a room ID now has to get it from state.room.roomId.
