Remove redundant code from t3lib_matchCondition in favour of using t3lib_matchCondition_frontend
In TYPO3 4.3-beta2 the backend conditions have been integrated and the condition matching was split in to classes for backend and frontend disposal. Thus, the code in t3lib_matchCondition is deprecated but maybe some extensions still rely on that class.
To reduce redundancy t3lib_matchConditions gets marked as deprecated and inherits from t3lib_matchCondition_frontend. An accordant testcase ensures that the functionality is still the same.
(issue imported from #M12488)