• Extended Taxonomies library has been merged in.
• Allow Composer autoloading (extended-cpts.php is specified as an autoloaded file).
• Bump minimum supported PHP version to 7.0.
• Bump minimum supported WordPress version to 4.8.
• Remove the funky init hook handling to bring functionality inline with core's register_post_type() and register_taxonomy().
• Use the connection field title for P2P connection column headings when possible.