Massive refactor of code into classes, improve security on the image/file upload handler. Clean up the init.php into a config.php and refactor everything else to work around it.

Resolves issues #13 #14 and #16

cms/config.php

@@ -0,0 +1,18 @@
+<?php
+/*
+ * Authentication stores the usernames and passwords for people to be able to use the CMS.
+ * This will be used as well to write to the audit log once it has been implemented in code.
+ */
+
+$config = [
+    'authentication' => [
+        // Add more users as needed - its 'username'=>'password' if you hadn't have guessed
+        'admin' => 'password123',
+    ],
+    // Enable the auditing system
+    'audit' => true,
+    // Set to true if you do not want to see the welcome page and want to go straight to your site
+    'skipWelcomePage' => false,
+    // Show full URL of the page being edited on the control bar
+    'showFullUrl' => true
+];