rn: fix losing audio if call is hangup too quickly
This PR changes the logic for connecting / disconnecting conferences. Instead of
doing it in mount / unmount events from the Conference component, it moves the
logic to the appNavigatee action.
This fixes a regression introduced in 774c5ecd when trying to make sure the
conference terminated event is always sent.
By moving the logic to appNavigate we no longer depend on side-effects for
connecting / disconnecting, and the code should be more maintainable moving
forward.
An improvement to this is the concept of sessions, which, while not tackled
here, was taken into consideration.
Contributing all buttons in one place goes against the designs that we
set out at the beginning of the project's rewrite and that multiple of
us have been following since then.
feat(toolbox): implement buttons using ToolboxItem
Currently the following are implemented:
- AudioMuteButton
- HangupButton
- VideoMuteButton
In order to implement these new buttons a new abstract class was introduced,
which abstracts the ToolboxItem into a button with enough hooks so a stateful
and a stateless version of it can be created.
This patch only adds the stateful implementation of the aforementioned buttons.