Protocol messages was added to the API to allow joining abstract rooms
by their chat_id― IM_JOIN_ROOM and IM_ROOM_JOINED. To make room in
anticipation of future room-related calls, some messages' values have
been shifted.
A JoinWindow was created (found through [Chat→Join Room] or [Alt-J] in
the main window), to allow joining a room with this protocol message.
The user can select which account the room should be joined from through
a drop-down menu in the lower left-hand corner― a design I think could
be replicated in other parts of Caya well.
Path() and SetPath() in CayaProtocol were renamed to AddOnPath() and
SetAddOnPath() respectively. GetName() and SetName() were also added,
where "name" is the account name (aka the leaf of the protocols settings
path).
To Server, a new KeyMap was added for convenience (AccountInstances), to
associate these account names with their instance IDs.