Fix access bugs:
@bug W-2089618@ INTERNAL should be allowed in system namespace for aura:event, aura:theme, and aura:registerEvent
@bug W-2089642@ Static access control method should be allowed in system namespace for Theme, Event and RegisterEvent
@bug W-2107455@ access attribute accepts multiple static methods(comma seperated) and uses the last one, expected to throw an error
@rev amcculloch@
Merging origin/aballard/master-pending-access-fixes2 into master