Optional use of custom resolver for all services

Configure usage of custom resolver for autolinker, bubble, context menu,
and omnibox from options.
New option to choose default tab for omnibox

Select whether omnibox entry should use the current tab, a new
background tab, or a new foreground tab.
Update autolinker permissions and options handling

More checking of permissions before assuming option is, or can be
enabled. Only check permissions on options page if autolink setting is
actually changed to prevent unnecessary permissions checking.
Version 2.1.0