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The localization capplet was never implemented and is not planned for the
next release of gnome-control-center.

Add a module and CcPanel implementation for the mouse settings.

The example panel implements CcPanel and registers itself as extending the
panel extension point. It provides a simple "Hello World" message. The
example panel is not build by default, but enabled through a configure option.

Set up the extension point and load plugins that are available. If a plugin
implements a particular panel, then load the CcPanel implementation instead
of executing the application.

The extension point name is used to identify modules that implement
new settings panels using CcPanel.

Also add various libtool flags that will be good practice for new panels.

libslab is no longer required since the new shell does not use it.

The new shell provides an implementation of CcShell and also removes the
dependency on libslab.

CcShell is an abstract class that represents an instance of a control
center shell. It provides access to some of the properties of the shell
that panels will need to read or change. When a panel is created it has an
instance of CcShell available that represents the current shell.

CcPanel is an abstract class used to implement panels for the shell. A
panel contains a collection of related settings that are displayed within
the shell window.

https://bugzilla.gnome.org/show_bug.cgi?id=616917

https://bugzilla.gnome.org/show_bug.cgi?id=597888

Fixes bug #616397