CRM-14727 - Fire case-change events which include Civi\CCase\Analyzer.

CRM-14727 - Fire case-change events which include Civi\CCase\Analyzer.

Notes:
 * The key underlying event (hook_civicrm_post) is already fired, but you
   have to bind to it a couple different ways (eg listen for a change to an
   "Activity" and then check the "case_id").
 * A key goal is to allow multiple event-listeners to use the same instance of $analyzer.
 * One can bind to the case-change event in one of three ways: (a) hooks, (b) event-dispatcher, (c) CiviCase XML listeners.