25368: Remove temp_ prefixes for dynamic_sidebar_before, dynamic_sidebar_after, dynamic_sidebar_has_widgets, and is_active_sidebar hooks. Add inline docs for these new hooks and for old dynamic_sidebar action and dynamic_sidebar_params filter.
25368: Third patch for docs for temp hooks
25368: Remove temp_ prefix from is_active_sidebar and dynamic_sidebar_has_widgets hooks; eliminate obsolete use of hacky dynamic_sidebar hook