This matches the new mockups as specified by Allan in
https://raw.github.com/gnome-design-team/gnome-mockups/master/system-settings/color/panel.png
The CcColorDevice and CcColorProfile widgets are lines in the EggListBox and are
smart by watching for changes in each colord device.
To use this new functionality you need colord from git master, and for the
'Laptop' devices to be recognised as internal, you also need to be _running_
gnome-settings-daemon from git, although this is not strictly required.
This makes loading faster, with less I/O, avoids unnecessary
code duplication (around 1k lines shaved), and ensures that
all the panels link and work appropriately.
By the same token, it will stop external panels from being
created, and loaded.
https://bugzilla.gnome.org/show_bug.cgi?id=690036