Obsolete transition and rate, and add end time for relative motion node.

Assets/Cryville/Common/Pdt/PdtInterpreter.cs

@@ -61,12 +61,12 @@ namespace Cryville.Common.Pdt {
 		/// <summary>
 		/// The source string.
 		/// </summary>
-		public string Source { get; private set; }
-		Binder _binder;
+		public string Source { get; protected set; }
+		protected Binder _binder;
 		/// <summary>
 		/// The current position in the string being parsed by the interpreter.
 		/// </summary>
-		public int Position { get; private set; }
+		public int Position { get; protected set; }
 #pragma warning disable IDE1006
 		/// <summary>
 		/// The character at the current position.