Permission error after moving sub menu item

[swissspidy]

Scenario:

1. Install a plugin like Google Analytics by Yoast or Jetpack
2. Move a random sub item of that plugin to the top level
3. Visit that page
4. Permission error occurs. :cry:

[swissspidy]

The current implementation uses add_menu_page and add_submenu_page for elements that were moved from top to sub or vice-versa. This lets WordPress do the rest. However, it forces me to re-add various hooks, currently:

• $hook
• admin_print_styles-$hook
• admin_print_scripts-$hook

Where $hook is the get_plugin_page_hookname() of the old menu item.

But there are probably many other hooks that exist for a menu page, so this is not bulletproof.

[swissspidy]

Probably quite safe now after 8c3c4567cfe15dd2f84ea64141f4ecfa59c76f03. Let's close this for now...