2d_engines - added link to Decker forum topic

2D Game Engines * ZZT (1991) * text-mode game with its own editor and scripting language * Adventure Game Studio (1997-) * for graphical point-and-click adventure games * O.H.R.RPG.C.E. (1997-) * Official Hamster Republic Role Playing Game Construction Engine (for classic NES/SNES/GBA-style RPGs)