Refactor getBuiltInMacros() to be SBSv1 specific. This are the hard-coded macros misc macros we are adding for SBSv1. For SBSv2, they are retrieved from the sbs config query. Also, clean up some API and comments on public APIS

<?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>