plugins onAutoload now only overloads if necessary (extlibs etc.)

lib/plugin.php now has a parent onAutoload function that finds most common
files that are used in plugins (actions, dataobjects, forms, libs etc.) if
they are put in the standardised directories ('actions', 'classes', 'forms',
'lib' and perhaps some others in the future).

plugins/Sample/SamplePlugin.php

@@ -174,41 +174,6 @@ class SamplePlugin extends Plugin
         return true;
     }
 
-    /**
-     * Load related modules when needed
-     *
-     * Most non-trivial plugins will require extra modules to do their work. Typically
-     * these include data classes, action classes, widget classes, or external libraries.
-     *
-     * This method receives a class name and loads the PHP file related to that class. By
-     * tradition, action classes typically have files named for the action, all lower-case.
-     * Data classes are in files with the data class name, initial letter capitalized.
-     *
-     * Note that this method will be called for *all* overloaded classes, not just ones
-     * in this plugin! So, make sure to return true by default to let other plugins, and
-     * the core code, get a chance.
-     *
-     * @param string $cls Name of the class to be loaded
-     *
-     * @return boolean hook value; true means continue processing, false means stop.
-     */
-    function onAutoload($cls)
-    {
-        $dir = dirname(__FILE__);
-
-        switch ($cls)
-        {
-        case 'HelloAction':
-            include_once $dir . '/' . strtolower(mb_substr($cls, 0, -6)) . '.php';
-            return false;
-        case 'User_greeting_count':
-            include_once $dir . '/'.$cls.'.php';
-            return false;
-        default:
-            return true;
-        }
-    }
-
     /**
      * Map URLs to actions
      *