Rewrite from scratch menu.

This includes a lot of features added! One should be that it should now work for restricted accounts. Unfortunately, this + user logged out is broken as fuck. The menu will add more links, and you might have already noticed that there are a few that are removed. Also, if you're searching the search forms, look down in the page and you'll find them ;). This release is semi-stable, meaning that I only need to add some other links and testing on chrome, testing with restricted accounts and then we're ready to push to /forums/2! By the way, this will now update to the latest submitted commit, so you're always up-to-date! Enjoy your fresh-designed osu! website! :)
Avoid wiki since it's broken.