Trebuchet : Icon pack theme

This patchset allows the user to set an icon pack
for the entire launcher.

Change-Id: I3dc8311f7e0a7a4f174fd568aa1d74b5ceb8471a
Merge "Trebuchet : Icon pack theme" into cm-10.2
Merge remote-tracking branch 'cm/cm-10.2' into cm-10.2