Fix potential order inconsistency of element and property lists.

Assets/Cryville/Common/Collections/Generic.meta

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

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+using System.Collections;
+using System.Collections.Generic;
+
+namespace Cryville.Common.Collections.Generic {
+	public interface IPairList : IList {
+		void Add(object key, object value);
+	}
+	public interface IPairList<TKey, TValue> : IList<KeyValuePair<TKey, TValue>>, IPairList {
+		void Add(TKey key, TValue value);
+	}
+}

Assets/Cryville/Common/Collections/Generic/IPairList.cs.meta

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

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+using System;
+using System.Collections;
+
+namespace Cryville.Common.Collections.Generic {
+	public struct PairCollection : IDisposable {
+		public void Dispose() { }
+		IPairList _pairList;
+		IDictionary _dictionary;
+		public PairCollection(object collection) : this() {
+			var type = collection.GetType();
+			if (typeof(IPairList).IsAssignableFrom(type)) _pairList = (IPairList)collection;
+			else if (typeof(IDictionary).IsAssignableFrom(type)) _dictionary = (IDictionary)collection;
+			else throw new ArgumentException("Parameter is not a pair collection");
+		}
+		public void Add(object key, object value) {
+			if (_pairList != null) _pairList.Add(key, value);
+			else _dictionary.Add(key, value);
+		}
+	}
+}

Assets/Cryville/Common/Collections/Generic/PairCollection.cs.meta

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

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+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");
+			}
+		}
+	}
+}

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

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