Web view with web3.site support (#4313)

* Web-domain based routing

* Support base32-encoded urls

* Proper support for non-domain based routing

* Handling long domain names

* Switching to web3.site

* Encoding for *.web3.site urls

* Add DappUrlInput component

* Update Web views with store

* Update spec description

* Update spec description

* edited url does not allow in-place store edits

* Fixing dapps access on 127.0.0.1:8180

* Use /web/<hash> urls for iframe

* Redirecting to parity.web3.site

* Disabling the redirection