Implement Duel (#965)
Implement Duel (#965)

* Implement Duel
Antaiseito/throneteki_for_doomtown,jbrz/throneteki,samuellinde/throneteki,samuellinde/throneteki,cryogen/throneteki,jbrz/throneteki,cryogen/gameteki,DukeTax/throneteki,Antaiseito/throneteki_for_doomtown,DukeTax/throneteki,cryogen/gameteki,ystros/throneteki,cryogen/throneteki