api: add widget getOnOpListener

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

@@ -693,15 +693,31 @@ public interface Widget
 	void revalidateScroll();
 
 	/**
-	 * Array of widget key listeners
+	 * Gets the script and arguments to be ran when a menu action is clicked.
+	 *
+	 * @return
+	 */
+	Object[] getOnOpListener();
+
+	/**
+	 * Gets the script and arguments to be ran when a key is pressed.
+	 *
+	 * @return
 	 */
 	Object[] getOnKeyListener();
 
 	/**
-	 * Array of widget load listeners
+	 * Gets the script and arguments to be ran when a interface is loaded.
+	 *
+	 * @return
 	 */
 	Object[] getOnLoadListener();
 
+	/**
+	 * Gets the script and arguments to be ran when one of the listened for inventories changes.
+	 *
+	 * @return
+	 */
 	Object[] getOnInvTransmitListener();
 
 	/**