Implements Config and Logging plugins, tidies Main

Added Database and Flatfile plugin engines for both Config and Log classes.
Rewrote Main to make use of the new plugins.
Updated config file definitions to make use of plugins.

source/lib/Sihnon/Config/Plugin/Database.class.php

@@ -0,0 +1,33 @@
+<?php
+
+class Sihnon_Config_Plugin_Database extends Sihnon_PluginBase implements Sihnon_Config_IPlugin {
+    
+    /**
+     * Name of this plugin
+     * @var string
+     */
+    const PLUGIN_NAME = "Database";
+    
+    private $database;
+    private $table;
+    
+    protected function __construct($options) {
+        $this->database = $options['database'];
+        $this->table    = $options['table'];
+    }
+    
+    public static function create($options) {
+        return new self($options);
+    }
+    
+    public function preload() {
+        return $this->database->selectAssoc("SELECT name,type,value FROM {$this->table}", 'name', array('name', 'value', 'type'));
+    }
+    
+    public function save() {
+        throw new Sihnon_Exception_NotImplemented();
+    }
+    
+}
+
+?>