runelite-api: Use more general Shape for clickboxes and convex hulls

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

@@ -26,6 +26,7 @@ package net.runelite.api;
 
 import java.awt.Graphics2D;
 import java.awt.Polygon;
+import java.awt.Shape;
 import java.awt.image.BufferedImage;
 import javax.annotation.Nullable;
 import net.runelite.api.annotations.VisibleForDevtools;
@@ -218,7 +219,7 @@ public interface Actor extends Renderable
 	 * @return the convex hull
 	 * @see net.runelite.api.model.Jarvis
 	 */
-	Polygon getConvexHull();
+	Shape getConvexHull();
 
 	/**
 	 * Gets the world area that the actor occupies.