Show QRCode with ToxID in profile

[Nokta-strigo]

I think QRCode is very convenient way of sharing your ToxID, especially with mobile devices. And typing ToxID is not convenient at all ;-)
So I think it's a great feature to show QRCode with ToxID in one's profile.

[Swoy]

I will look into improving this around the holidays, unless someone else beat me to it. Anything specific styles or whatnot you want?