Disabled external gits

Permafrost/src/platform/game/signals/Not.java

@@ -0,0 +1,17 @@
+package platform.game.signals;
+
+public class Not implements Signal {
+	private final Signal signal;
+
+	public Not (Signal signal) {
+		if (signal == null) {
+			throw new NullPointerException(); 
+		}
+		this.signal = signal;
+	}
+
+	@Override
+	public boolean isActive() {
+		return !signal.isActive();
+	}
+}