Add stub for judge action @var.

Assets/Cryville/Crtr/JudgeAction.cs

@@ -20,6 +20,9 @@ namespace Cryville.Crtr {
 			else if (a.Remove("score")) {
 				return new Score(a, k);
 			}
+			else if (a.Remove("var")) {
+				return new Variable(a, new Identifier(k));
+			}
 			throw new FormatException("Invalid judge action format.");
 		}
 		public readonly HashSet<string> annotations;
@@ -64,5 +67,15 @@ namespace Cryville.Crtr {
 				return new JudgeActionResult();
 			}
 		}
+		public class Variable : JudgeAction {
+			readonly Identifier _target;
+			public Variable(IEnumerable<string> a, Identifier k) : base(a) {
+				_target = k;
+			}
+			internal override JudgeActionResult Execute(IJudge judge, JudgeEvent ev, float time, PdtExpression exp, bool onMiss, int depth, int index) {
+				// throw new NotImplementedException();
+				return new JudgeActionResult();
+			}
+		}
 	}
 }