Add FileExtensionTextMode plugin

a plugin to customize the join of file extension and the text mode.

also add an API to the editor for this.

components/fileExtTextMode/getFileExtTextModes.php

@@ -0,0 +1,19 @@
+<?php
+
+require_once '../../common.php';
+require_once 'defaultValues.php';
+
+Common::checkSession();
+
+$ext = false;
+//ignore warnings
+$ext = @Common::getJSON('fileExtensions.php');
+
+if(!is_array($ext)){
+	//default extensions
+	$ext = $defaultExtensions;
+}
+
+echo json_encode(array('status' => 'success', 'msg' => 'Extensions send', 'extensions' => $ext));
+
+?>