runelite-api: add getConvexHull to Actor

runelite-api/src/main/java/net/runelite/api/Actor.java

@@ -68,4 +68,6 @@ public interface Actor extends Renderable
 	 * Returns the logical height of the actor's model. This is roughly where the health bar is drawn.
 	 */
 	int getLogicalHeight();
+
+	Polygon getConvexHull();
 }

runelite-mixins/src/main/java/net/runelite/mixins/RSActorMixin.java

@@ -48,6 +48,7 @@ import net.runelite.rs.api.RSCombatInfo1;
 import net.runelite.rs.api.RSCombatInfo2;
 import net.runelite.rs.api.RSCombatInfoList;
 import net.runelite.rs.api.RSCombatInfoListHolder;
+import net.runelite.rs.api.RSModel;
 import net.runelite.rs.api.RSNode;
 
 @Mixin(RSActor.class)
@@ -188,4 +189,16 @@ public abstract class RSActorMixin implements RSActor
 		graphicChanged.setActor(this);
 		eventBus.post(graphicChanged);
 	}
+
+	@Inject
+	@Override
+	public Polygon getConvexHull()
+	{
+		RSModel model = getModel();
+		if (model == null)
+		{
+			return null;
+		}
+		return model.getConvexHull(getX(), getY(), getOrientation());
+	}
 }