Add invalidation for property source. Fix cache lock for scores.

Assets/Cryville/Crtr/Judge.cs

@@ -150,10 +150,12 @@ namespace Cryville.Crtr {
 				var key = scoreop.Key;
 				_etor.ContextSelfValue = scoreSrcs[key.name.Key];
 				_etor.Evaluate(scoreOps[key.name.Key], scoreop.Value);
+				scoreSrcs[key.name.Key].Invalidate();
 				foreach (var s in _rs.scores) {
 					if (s.Value.value != null) {
 						_etor.ContextSelfValue = scoreSrcs[s.Key.Key];
 						_etor.Evaluate(scoreOps[s.Key.Key], s.Value.value);
+						scoreSrcs[s.Key.Key].Invalidate();
 					}
 				}
 			}

Assets/Cryville/Crtr/PropSrc.cs

@@ -6,6 +6,7 @@ namespace Cryville.Crtr {
 	public abstract class PropSrc {
 		int _type;
 		byte[] _buf = null;
+		public void Invalidate() { _buf = null; }
 		public void Get(out int type, out byte[] value) {
 			if (_buf == null) InternalGet(out _type, out _buf);
 			type = _type;