udisks exposes a D-Bus API for drive detection. UDisks provides a
similar API to BraseroMediumMonitor for drive monitoring and
inspection, but does not include any GTK widgets. A new class,
SjDriveManager, implements the signal handlers to detect when new
drives are added and removed from the system, in turn emitting its
own signals. The UI and main application connects its own handlers to
those signals in order to update the UI and perform device operations
(such as reading CD track listings).

The BraseroDriveSelection widget is replaced by a standard
GtkComboBox. This combobox is backed by a GtkListStore, populated
with drives detected by SjDriveManager. Via signal handlers, when
drives are added or removed, the GtkListStore is updated accordingly.

Notably, sj-metadata.c in libjuicer *does not* make use of
SjDriveManager, since it's in a separately compiled static library.
However, it does make use of a UDisksClient directly, so that the
Brasero dependency can be dropped.