CleanupPlugin: a chance to cleanup a plugin at the end of a program
+StartActionExecute: Right before the "prepare" call of the current Action
+- $action: the current Action object
+- &$args: array of arguments, referenced so you can modify the array
+
+EndActionExecute: Right after the "handle" call of the current Action
+- $action: the current Action object
+
StartPrimaryNav: Showing the primary nav menu
- $action: the current action
- $out: HTMLOutputter used to output (usually an Action, but not always!)
- $menu: The Menu object outputted as a submenu.
- $label: Localized text which represents the menu item.
+
+StartDocNav: Before outputting the docs Nav
+- $nav: The DoclNav widget
+
+EndDocNav: After outputting the docs Nav
+- $nav: The DoclNav widget