LightLauncher: Icon pack theme

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

Change-Id: I3dc8311f7e0a7a4f174fd568aa1d74b5ceb8471a

Conflicts:
	src/com/losp/launcher/LauncherApplication.java
	src/com/losp/launcher/preference/Preferences.java