Add frontend support for anonymous user login

[Reeywhaar]

to #279

depends on #281

Adds support for anonymous user login

[umputun]

This is a scary looking one ;) It seems to include all refactoring, i.e. on top of #281. I think we should finalize refactoring and rebase on top if it

[umputun]

another thing on my side - probably it makes sense to set dev-style avatar (identicon) for anonymous users

[Reeywhaar]

Yep, when refactoring will be merged I think github should start to show commits on base of refactoring top.

I've made anonymous avatar in style of lost avatar, but yeah, better to show different icons.

[umputun]

Can you add anon to your demo page on go-pkgz/auth pls? This way I will able to see it in action

[Reeywhaar]

@umputun let me know when you add identicon support. I need to handle it as well, as now in case of anonymous login predefined icon displayed.

[umputun]

should be in place - released v0.5.0 of pkgz/auth and updated dependency here.

[Reeywhaar]

Updated to use identicons.

[umputun]

ping ping. @igoradamenko / @Guria - any chance you can review this one, pleeease?

[Reeywhaar]

Well, I'm myself busy until next weekend probably, so #297, #291, #285 etc... will have to wait if no one wishes to participate.

[Guria]

@umputun will take a look this week