Add a mob extension plugin for walking to entities

Adds a new mob extension plugin which creates a walk_to() method on
Mobs to allow walking to another entity (accounting for the size of the
entity) with an optional facing position.

game/src/main/org/apollo/game/model/entity/Mob.java

@@ -103,6 +103,11 @@ public abstract class Mob extends Entity {
 	 */
 	private Direction firstDirection = Direction.NONE;
 
+	/**
+	 * The last facing direction of this mob.
+	 */
+	private Direction lastDirection = Direction.NORTH;
+
 	/**
 	 * This mob's second movement direction.
 	 */
@@ -196,8 +201,8 @@ public abstract class Mob extends Entity {
 	 */
 	public final Direction[] getDirections() {
 		if (firstDirection != Direction.NONE) {
-			return secondDirection == Direction.NONE ? new Direction[]{ firstDirection }
-				: new Direction[]{ firstDirection, secondDirection };
+			return secondDirection == Direction.NONE ? new Direction[]{firstDirection}
+				: new Direction[]{firstDirection, secondDirection};
 		}
 
 		return Direction.EMPTY_DIRECTION_ARRAY;
@@ -268,6 +273,15 @@ public abstract class Mob extends Entity {
 		return inventory;
 	}
 
+	/**
+	 * Gets the last facing direction of this mob.
+	 *
+	 * @return The last direction this mob was facing.
+	 */
+	public Direction getLastDirection() {
+		return lastDirection;
+	}
+
 	/**
 	 * Gets this mob's local npc {@link List}.
 	 *
@@ -425,6 +439,15 @@ public abstract class Mob extends Entity {
 		blockSet.add(SynchronizationBlock.createInteractingMobBlock(mob.getInteractionIndex()));
 	}
 
+	/**
+	 * Set the last direction this mob was facing.
+	 *
+	 * @param lastDirection The direction to set.
+	 */
+	public void setLastDirection(Direction lastDirection) {
+		this.lastDirection = lastDirection;
+	}
+
 	/**
 	 * Sets the {@link Position} of this mob.
 	 * <p>
@@ -470,7 +493,7 @@ public abstract class Mob extends Entity {
 	 * Gets the number of tiles this mob occupies.
 	 *
 	 * @return The number of tiles this mob occupies.
-     */
+	 */
 	public int size() {
 		return definition.map(NpcDefinition::getSize).orElse(1);
 	}
@@ -548,4 +571,5 @@ public abstract class Mob extends Entity {
 		world.schedule(new SkillNormalizationTask(this));
 	}
 
+
 }

game/src/main/org/apollo/game/model/entity/WalkingQueue.java

@@ -146,6 +146,7 @@ public final class WalkingQueue {
 			} else {
 				previousPoints.add(next);
 				position = new Position(next.getX(), next.getY(), height);
+				mob.setLastDirection(firstDirection);
 
 				if (running) {
 					next = points.poll();
@@ -158,6 +159,7 @@ public final class WalkingQueue {
 						} else {
 							previousPoints.add(next);
 							position = new Position(next.getX(), next.getY(), height);
+							mob.setLastDirection(secondDirection);
 						}
 					}
 				}