Do not hard-code schedulable types in cod_schedule_scheduler_pane.inc

Credit goes to B_man for this.

Cleaning up the patch.

This syntax isn’t compatible with PHP 5.3. I’d be okay with dropping support for PHP 5.3.

cod_schedule/plugins/content_types/cod_schedule_sessions_pane.inc could also use an update:

function cod_schedule_sessions_admin_page($node) {
  $content = array();
  $content['type_selector'] = array(
    '#type' => 'select',
    '#attributes' => array(
      'id' => 'schedule-items-type-select',
    ),
  );
  // TODO: In drupal8 we'll not do something bad like this
  if (module_exists('cod_session')) {
    $content['type_selector']['#options']['session'] = t('Session');
    …

We can not do bad things in Drupal 7, too.

This is the combined patch for #6 & #3

Another patch snuck in, this should be better.