`Danbooru.Post.approve` is used for approving posts via the mode menu.
It doesn't hide all the notices or the approve/disapprove/flag buttons.
Click the link instead to hide those things.
Click the #quick-mod-approve link instead of #approve because #approve
prompts for confirmation.
* Use .on() instead of .bind() because bind is deprecated in jquery 3.0.
* Ensure enable-js-navigation is always respected.
* Namespace keybindings so they may be disabled by userscripts with
e.g. $(document).off("keydown.danbooru") or $(document).off("next_page").
