Added visibility attribute for CanvasElements
Added visibility attribute for CanvasElements

Zarakichi/ObEngine,Sygmei/ObEngine,Zarakichi/ObEngine,Mizugola/MeltingSaga,Zarakichi/ObEngine,Sygmei/ObEngine,Mizugola/MeltingSagaEngine,Mizugola/MeltingSaga,Mizugola/ObEngine,Mizugola/ObEngine,Mizugola/MeltingSagaEngine