Issue #2154141 by Enxebre, pcambra: DevelGenerate as a D8 plugin type.
Issue #2208597 by andyceo, andypost, ianthomas_uk: Devel HEAD broken: Update calls to config(), drupal_map_assoc, Drupal\Core\Mail\PhpMail.
Issue #2208337 by penyaskito: Move type to the first line in devel.info.yml.
Issue #2208323 by penyaskito: Use devel.local_tasks.yml for tabs.
Minor fixes in the Plugin manager and removing drupal_map_assoc