[feature/module_services] Start using services for modules

This includes a module_interface and module_base for the modules.
Adding, moving, or managing modules doesn't work yet.

modules/module_base.php

@@ -0,0 +1,72 @@
+<?php
+/**
+*
+* @package Board3 Portal v2.1
+* @copyright (c) 2013 Board3 Group ( www.board3.de )
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License
+*
+*/
+
+namespace board3\portal\modules;
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* @package module_base
+*/
+abstract class module_base implements module_interface
+{
+	/**
+	* @inheritdoc
+	*/
+	public function get_allowed_columns()
+	{
+		return $this->columns;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function get_name()
+	{
+		return $this->name;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function get_image()
+	{
+		return $this->image_src;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function get_language()
+	{
+		return $this->language;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function install($module_id)
+	{
+		return true;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function uninstall($module_id)
+	{
+		return true;
+	}
+}