Runtime should be a date/time field instead of a drop down

MR is missing an entity definition update hook for existing installations. Something like:

function function poll_update_8002(&$sandbox) {
  \Drupal::entityDefinitionUpdateManager()->updateEntityType(
    \Drupal::entityTypeManager()->getDefinition('poll')
  );
}

In the meantime, for those who need this feature now, install https://www.drupal.org/project/entity_definition_update → and run:

drush php:eval '$entityDefinitionUpdate = \Drupal::service("entity_definition_update.entity_definition_update_manager");
$entityDefinitionUpdate->applyUpdates();'

Furthermore, you may need to prefer source due to a conflict with Drupal.org packaging information:
https://www.drupal.org/project/drupal/issues/3036459#comment-13448693 🐛 Packaging info from .info.yml often creates conflicts when patching Active

MR updated to include field storage definition update hook. Also fixed the ability to unset runtime on an existing poll.

MR Still has failing tests. Needs to be rebased for 2.0.x as well.