major rewrite of menu code, tons of bug and usability fixes, faster, and better cross browser integration, and RTL support

remove AJAX callback, pass menu structure to page directly, dramatically faster, 1 less HTTP request, clear your menu cache, can produce weirdness/infinit loops

#114015, advanced menu settings to place menu anywhere on page, patch by Steve McKenzie, modified by me

#108098 fix cursor being hidden in firefox, patch by quicksketch. note, the menu no longer stays on top as you scroll, however forms are usable once again. this feature will return in version 3 when it's rewritten to be 100% jQuery.