Rearrange the ToolbarButtons in the secondary Toolbar in order to mostly
group the media-related ones such as the AudioRouteButton, the
switchCamera button, and the audio-only mode button.

It emulates Android's BottomSheet in pure JavaScript. It's implemented as
another Dialog, so it can be used instead of one.

The implementation only supports text options with an associated icon, and an
optional 'selected' marker.