major refactor to wrap retieval of macros all around ISymbianBuildContext, to avoid need to access internal apis. Added getTargetTypeMacro(String targettype), List<IDefine> getMetadataMacros(), List<IDefine> getBuildMacros().

<?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>