Use text input instead of button so autocomplete works on Firefox

[sjcallender]

• https://3.basecamp.com/3091851/buckets/26456130/todos/9588904795#__recording_9633716521
  • Switches to use <input type="text"> instead of <button> because Firefox is strict about not auto-filling invisible form fields. This allows us to set autocomplete values.
  • Merge matchAutofillValue, selectByValue, and matchOptionByValue into selectByValue
  • prevents the State field from being focused after autofill is performed. keeps the focus on the original field.
  • prevents the first letter from being ignored in the text input field if that letter keydown was what triggered the dropdown to open.
  • Fix front-end validation
  • Remove state/region field for countries with no state/region options