…nto core/#8264-room-types

…l over their definitions beyound the expected.

This allows for each different type of room to define
which setting it wants to display instead of them
being hard coded on the settings tab controller.

…ng custom room types

…r the user is authorized to create the room type

Provide implementation for the confirmation dialogs on leave and hide

(cherry picked from commit b463b84)

This adds better internal APIs for the creation and states of custom room objects.