Qora was not the first integrating AT into the core and is not a NXT clone. BURST from the other hand which is a NXT clone ( using different proof, called proof of work ) is the first platform with AT. I am not sure about the latest commits of NXT but for sure it would be very easy to port it from BURST. ( https://github.com/BurstProject/burstcoin/tree/master/src/java/nxt/ )