CRM-20802 - CaseType - Flush any in-memory caches that might reference case-type

[totten]

== Description

Suppose we're running this snippet:

addToTimeline('housing_support', array('name' => 'Case Task', 'reference_activity' => 'Open Case', 'reference_offset' => '9', 'reference_select' => 'newest'));
civicrm_api3('Case', 'create', array(...'housing_support'...));

function addToTimeline($caseType, $timelineEntry) {
  $caseType = civicrm_api3('CaseType', 'getsingle', array('name' => $caseType));

  foreach ($caseType['definition']['activitySets'] as &$actSet) {
    if ($actSet['name'] === 'standard_timeline') {
      $actSet['activityTypes'][] = $timelineEntry;
    }
  }

  civicrm_api3('CaseType', 'create', array(
    'id' => $caseType['id'],
    'definition' => $caseType['definition'],
  ));
}

== Before

The resulting Case record does not have the Case Task activity.

== After

The resulting Case record does have the Case Task activity.

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• CRM-20802: CaseType.create - Stale definition retained in memory