added decouple and EngageDecoupler action

src/main/java/de/srsoftware/web4rail/tiles/DecouplerV.java

@@ -0,0 +1,30 @@
+package de.srsoftware.web4rail.tiles;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import de.srsoftware.web4rail.Connector;
+import de.srsoftware.web4rail.Plan.Direction;
+import de.srsoftware.web4rail.tiles.Turnout.State;
+
+public class DecouplerV extends Decoupler{
+	
+	@Override
+	public Map<Connector, State> connections(Direction from) {
+		if (isNull(from) || oneWay == from) return new HashMap<>();
+		switch (from) {
+			case NORTH:
+				return Map.of(new Connector(x+width(),y,Direction.NORTH),State.UNDEF);
+			case SOUTH:
+				return Map.of(new Connector(x-1,y,Direction.SOUTH),State.UNDEF);
+			default:
+				return new HashMap<>();
+		}
+	}
+	
+	@Override
+	public List<Direction> possibleDirections() {
+		return List.of(Direction.SOUTH,Direction.NORTH);
+	}
+}