In preperation for upcoming room screens.
RoomInfo is supposed to be used in conjunction with
the Room class.
They are not merged (Room as a attribut in RoomInfo),
because whilst Room can be stored on disk,
RoomInfo can not.
This is done to prevent tampering with the data
(when offline).
This also makes hiding elements easier when the user is offline,
as we can just pretend, that they do not have the required permission.
If the room was created successfully,
the wizard automatically saves the room data on disk.
This allows it to be cached,
even if the user loses internet connection
right before the wizard exists.
That way the room will be cached.
