There's much going on under the hood here:
- Styli and tablets are now in split views, as per the mockups.
- CcWacomDevice and CcWacomTool are now in use, with the subsequent
API use changes. Moreover, using these objects means using the
newer schemas in gsettings-desktop-schemas, so there had to be
changes in the settings we store too.
- We now use CcTabletToolMap, plus listen to tool proximity events,
populating the "Stylus" sub-pane with those.
Provides a barebones implementation of a panel for selecting the
display to map a tablet to. This implementation uses a combo box
instead of the Display-panel-like UI specified by the mockup since
my Cairo and GTK-fu are weak.
https://bugzilla.gnome.org/show_bug.cgi?id=668546
