refactoring usage for getting variant.hrh and compiler preinclude macros. Now should use ISymbianContext both for preprocessed results and getting the IPath to the file. Removed start-up checks for Perl version.

<?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>