Revert "Trebuchet : Icon pack support"

This is no longer needed because of the awesome new Themes Engine

This reverts commit 89970649602163ba8cb5c01c4c77534f45b66121.

Change-Id: I1dca53b8c8020ecb6ab7b0da6931f380564eda85
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0