Move Active negotiation selector to the Outlet iframe/tab

[oleggrib]

Currently user decide what token to use in the own page, where user have access to everyhting and webster can easy collect use tokens data by set mode to "passive" and track user for ads etc. its not secure.

I suggest to move active negotiation token selector to the Outlet page. In this case user always have to approve tokens to share, so webster cant silently track tokens where active negotiation set for Outlet.

It adds some challenge , because some browsers can force to show full size tabs, but Outlet page styles are separated from webster page and will look exact as we design it, no way to style overlap.

@nicktaras , @micwallace , @weiwu-zhang , what do you think?