Improved outage class encapsulation. Added outagedb as DB Context. Other minor changes.

settings.php

@@ -24,6 +24,8 @@
  */
 defined('MOODLE_INTERNAL') || die;
 
+// FIXME If plugin not installed, it is still generating the category Outage under Auth Plugins.
+
 if ($hassiteconfig) {
     // Configure default settings page.
     $settings->visiblename = "Defaults";