Hizb ut-Tahrir (Party of Liberation) supporters calling for a worldwide Islamic state have marched through Gaza for the first time.About 3,000 demonstrators waved black flags and shouted slogans calling for a global Islamic government Thursday. Hizb ut-Tahrir seeks to establish a caliphate that would govern the world according to Islamic law. The group is banned in several countries, including Russia, Germany and some Arab states. The group says it uses…