Remove hard dependency on Qt plugins; make their resolution optional. Without this, most of Carbide fails to load if any Qt plugin is missing.
<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>
<extension-point id="featureUseTracker" name="Feature Usage Tracker" schema="schema/featureUseTracker.exsd"/>
</plugin>