Refactoring base class to traits.

Most of the code from the base class (class.base.php) has been removed.
Code is now loaded via 2 traits NotifierManager and ObserverManager
The reason for this change is to allow classes to use the Observer/Notifier system
without extending the base class.
Any class that wants to use notifiers need now only `use` the NotifierManager
and observer classes `use` the ObserverManager.

Note the camelize method has been left in the base class for now to preserver backward
compatibilty, but that will probably change going forward.

I've also taken the opportunity to consolidate the 2 psr4Autoload config files into one.

admin/includes/application_bootstrap.php

@@ -146,11 +146,11 @@
 /**
  * psr-4 autoloading
  */
-require DIR_FS_CATALOG . DIR_WS_CLASSES . 'class.base.php';
 require DIR_FS_CATALOG . DIR_WS_CLASSES . 'vendors/AuraAutoload/src/Loader.php';
 $psr4Autoloader = new \Aura\Autoload\Loader;
 $psr4Autoloader->register();
-require('includes/psr4Autoload.php');
+require(DIR_FS_CATALOG . 'includes/psr4Autoload.php');
+require DIR_FS_CATALOG . DIR_WS_CLASSES . 'class.base.php';
 
 require 'includes/classes/AdminRequestSanitizer.php';
 require 'includes/init_includes/init_file_db_names.php';