created plugin custer, and removed shortcodes change_id and user_infos from cipf plugin

plugins/custer/author_id.php

@@ -0,0 +1,42 @@
+<?php
+//namespace CUSTER;
+
+/*
+* it means someone outside wp is accessing the file, in this case kill it.
+*/
+if (!defined('ABSPATH')) {
+	die('You can not access this file!');
+}
+
+
+
+
+
+/*
+* get the current author id
+* return 0 if not found
+* get id outside loop : https://wordpress.stackexchange.com/q/65548
+*
+*/
+function get_author_id() {
+	if (is_author()) {
+		$user_id = get_queried_object_id();
+	}
+	else if (in_the_loop()) {
+		$user_id = get_the_author_meta('ID');
+	}
+//		else if (is_singular()) {
+//			$user_id = get_queried_object()->post_author;
+//		}
+	else {
+		$user_id = 0;
+	}
+
+	return $user_id;
+}
+
+
+
+
+
+?>