Country flag icons — from flag-icons by Panayiotis Lipiridis (https://github.com/lipis/flag-icons)
Licence: MIT (see LICENSE.txt) — free for commercial use AND redistribution, which is why this
set is used rather than countryflags.com (that one requires a purchased commercial licence and
forbids redistributing the files, which a panel that ships to customers cannot satisfy).
Naming: ISO 3166-1 alpha-2, lowercase, 4x3 aspect. Rendered by flag_icon() in components/icons.php.
