Tidied plugin architecture.

Moved common default init/name methods to a base class, common to all
plugin types.
Added phpdoc comments to various plugin methods.
Updated HandBrake plugins to reflect core changes.

lib/RippingCluster/PluginBase.class.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * Base class for all plugins, providing default implementations for 
+ * standard plugin methods.
+ * 
+ * @class RippingCluster_PluginBase
+ */
+class RippingCluster_PluginBase {
+    
+    /**
+     * Provides a basic initialisation function that does nothing.
+     * 
+     */
+    public static function init() {
+        // Nothing to do
+    }
+    
+    /**
+     * Returns the name of this plugin
+     * 
+     * @return string
+     */
+    public static function name() {
+        return static::PLUGIN_NAME;
+    }
+    
+}
+
+?>