Follow-up to #5691. Strengthen shdocvw_apitest testcase. Fix CLSID_MruPidlList class. CORE-9283
Follow-up to #5634. - Implement CMruBase::_UseEmptySlot. - Implement CMruLongList and CMruShortList. - Add CMruClassFactory class and modify DllGetClassObject function by using it. - Add shdocvw_apitest.exe. CORE-9283