Add WidgetItemOverlay

This simplifies the logic required for plugins to draw an overlay over an item.

runelite-api/src/main/java/net/runelite/api/hooks/Callbacks.java

@@ -29,6 +29,7 @@ import java.awt.event.KeyEvent;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseWheelEvent;
 import net.runelite.api.MainBufferProvider;
+import net.runelite.api.widgets.WidgetItem;
 
 /**
  * Interface of callbacks the injected client uses to send events
@@ -79,6 +80,11 @@ public interface Callbacks
 	 */
 	void draw(MainBufferProvider mainBufferProvider, Graphics graphics, int x, int y);
 
+	/**
+	 * Called before the client will render an item widget.
+	 */
+	void drawItem(int itemId, WidgetItem widgetItem);
+
 	/**
 	 * Mouse pressed event. If this event will be consumed it will not be propagated further to client.
 	 *

runelite-api/src/main/java/net/runelite/api/widgets/WidgetItem.java

@@ -25,11 +25,15 @@
 package net.runelite.api.widgets;
 
 import java.awt.Rectangle;
+import lombok.AllArgsConstructor;
+import lombok.ToString;
 import net.runelite.api.Point;
 
 /**
  * An item that is being represented in a {@link Widget}.
  */
+@AllArgsConstructor
+@ToString
 public class WidgetItem
 {
 	private final int id;
@@ -37,20 +41,6 @@ public class WidgetItem
 	private final int index;
 	private final Rectangle canvasBounds;
 
-	public WidgetItem(int id, int quantity, int index, Rectangle canvasBounds)
-	{
-		this.id = id;
-		this.quantity = quantity;
-		this.index = index;
-		this.canvasBounds = canvasBounds;
-	}
-
-	@Override
-	public String toString()
-	{
-		return "WidgetItem{" + "id=" + id + ", quantity=" + quantity + ", index=" + index + ", canvasBounds=" + canvasBounds + '}';
-	}
-
 	/**
 	 * Gets the ID of the item represented.
 	 *