Decouple the usage of PDT evaluator of chart player.

Assets/Cryville/Crtr/Ruleset.cs

@@ -157,7 +157,7 @@ namespace Cryville.Crtr {
 			}
 		}
 		public void PrePatch(ChartEvent ev) {
-			var etor = ChartPlayer.etor;
+			var etor = PdtEvaluator.Instance;
 			PropSrc src;
 			etor.ContextCascadeInsert();
 			etor.ContextEvent = ev;