Changelog

added: filter hook gf_address_enhanced_countries so developers can change the map of country names to codes
changed: marked as tested up to WooCommerce 4.0

changed: US Minor Islands codes for WooCommerce now track WooCommerce v3.8, not v3.6
changed: sort state/province names using the current page's locale

changed: list of Chinese provinces now uses Macao spelling for that SAR (NB: Gravity Forms country list still uses the Portuguese spelling)
added: provinces of Zambia (ZM)
added: PHP functions for converting short ISO state codes into various code formats, state name

fixed: states / provinces not saving as a code when the User Registration feed has User Activation enabled
added: islands of the United States Minor Outlying Islands (UM)
changed: marked as tested up to WooCommerce 3.6

added: support for non-standard WooCommerce subdivision codes (many of which differ from ISO 3166-2 codes)
added: states / provinces for:
- Bangladesh
- Bulgaria
- Bolivia
- China
- Hong Kong
- India
- Iran
- Japan
- Liberia
- Malaysia
- Moldova
- Mexico
- Nepal
- New Zealand
- Pakistan
- Paraguay
- South Africa
- Tanzania
- Thailand
- Turkey
fixed: only save state as a code if option is enabled, otherwise preserve the state name in form entries
fixed: spelling correction for Indonesian provinces of Sumatra
fixed: changing the country clears the value of the state dropdown, avoiding incorrect state selection
changed: removed suppressed Italian provinces Carbonia-Iglesias, Medio Campidano, Olbia-Tempio, Ogliastra; added Sud Sardegna

fixed: prepopulating a Country dropdown from an ISO code (e.g. WooCommerce field) without a User Registration feed
changed: minimum required PHP version is now 5.6; recommended version is PHP 7.2 or higher
tested: WordPress 5.0, Gravity Forms 2.4 beta 2