Reworked css include/pref/tooltip/accesskey subsystem

Reworked css include/pref/tooltip/accesskey subsystem

* accesskeys and tooltips moved to js, needs to be customized/localized at MediaWiki:Monobook.js. Saves many calls to wfMsg, reduces page size, shows access key prefix depending on browser/os. Easy to customize by changing the ta array.
* skinphptal underline and justification wired up to produce generated css
* MediaWiki:Skin.css used for anons as well
* addcss call removed from header
* separate js var file included that holds things like the stylepath and the tooltip/accesskey array
* rtl css included from generated css