Implement custom ruleset config. (2)

Assets/Cryville/Crtr/Config/IPropertyAdapter.cs

@@ -12,6 +12,7 @@ namespace Cryville.Crtr.Config {
 		object[] Range { get; }
 		object GetValue();
 		void SetValue(object value);
+		event Action ValueChanged;
 		object MapValue(object value);
 		bool SetMapped { get; }
 		object MapValueInverse(object value);
@@ -35,6 +36,8 @@ namespace Cryville.Crtr.Config {
 		public object GetValue() { return _prop.GetValue(_target, null); }
 		public void SetValue(object value) { _prop.SetValue(_target, value, null); }
 
+		public event Action ValueChanged { add { } remove { } }
+
 		readonly double _precision;
 		readonly double _step;
 		readonly bool _logarithmic;