Add EventManager#registerListeners overload with lookup (#2441)

Author: A248

src/main/java/org/spongepowered/api/event/EventManager.java

@@ -26,6 +26,8 @@
 
 import org.spongepowered.plugin.PluginContainer;
 
+import java.lang.invoke.MethodHandles;
+
 /**
  * Manages the registration of event listeners and the dispatching of events.
  */
@@ -52,6 +54,22 @@ public interface EventManager {
      */
     EventManager registerListeners(PluginContainer plugin, Object obj);
 
+    /**
+     * Registers {@link Event} methods annotated with @{@link Listener} in the
+     * specified object.
+     *
+     * <p>This will not include any methods declared in supertypes, but will
+     * test for private and package-private listener methods.</p>
+     *
+     * <p>The provided lookup will be used for privileged access to the listener object.</p>
+     *
+     * @param plugin The plugin container
+     * @param obj The object
+     * @param lookup The lookup with which to access the listener object
+     * @return This manager, for fluency
+     */
+    EventManager registerListeners(PluginContainer plugin, Object obj, MethodHandles.Lookup lookup);
+
     /**
      * Un-registers an object from receiving {@link Event}s.
      *