9cd7914ea5
This makes the following changes: - Improve CountryDropdown by allowing all countries to be displayed at once and using PNGs for performance (trading of quality - the pngs are scaled down from 32px to 25px) - "I want to sign in with" dropdown to select login method - MXID login field that suffixes HS domain (whether custom or matrix.org) and prefixes "@" - Email field which is secretly the same as the username field but with a different placeholder - No more login flickering when changing ServerConfig (!) fixes https://github.com/vector-im/riot-web/issues/1517 This implements most of the design in https://github.com/vector-im/riot-web/issues/3524 but neglects the phone number login:  This will be updated in another PR to implement desired things: - Country code visible once a country has been selected (propbably but as a prefix to the phone number input box. - Use square flags - Move CountryDropdown above phone input and make it show the full country name when not expanded - Auto-select country based on IP
