Fix potential order inconsistency of element and property lists.

Assets/Cryville/Common/Collections/Generic/PairList.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+
+namespace Cryville.Common.Collections.Generic {
+	public class PairList : List<KeyValuePair<object, object>>, IPairList {
+		public void Add(object key, object value) {
+			Add(new KeyValuePair<object, object>(key, value));
+		}
+	}
+	public class PairList<TKey, TValue> : List<KeyValuePair<TKey, TValue>>, IPairList<TKey, TValue> {
+		public void Add(TKey key, TValue value) {
+			Add(new KeyValuePair<TKey, TValue>(key, value));
+		}
+
+		public void Add(object key, object value) {
+			try {
+				Add((TKey)key, (TValue)value);
+			}
+			catch (InvalidCastException) {
+				throw new ArgumentException("Wrong key type or value type");
+			}
+		}
+	}
+}