elm-ui fork for Insurello

This is a fork of elm-ui specifically for Insurello. It’s most likely not useful to anyone else.

Some facts about the fork:

• Based on elm-ui 1.1.7
• Merged Chrome focus fix: mdgriffith#362
• Changed default focus styles from :focus to :focus-visible.
• Replaced Element.focused with Element.focusedMouseAndKeyboard (= :focus) and Element.focusedKeyboardOnly (= :focus-visible).