taginfo returns results that match anywhere within the string. So in Canada, you might get results like US:CA:SF. This change filters out such results.
Added a variation of the combo field for road networks. If the field’s value is blank or shares a prefix with the current country code, search taginfo for values beginning with the country code and a colon.
* convert iD.Detect() iife to a module
* iD.Detect() should return loaded locale (except for 'en')
(The previous code was a hack to replace the detected locale with the loaded
locale. Now that Detect is a module, we can not replace the detected locale
from external code, but we can have Detect() return the locale we really want)
