Rename plugins to libs and update all file references

libs/vendor/illuminate/contracts/Support/MessageProvider.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Illuminate\Contracts\Support;
+
+interface MessageProvider
+{
+    /**
+     * Get the messages for the instance.
+     *
+     * @return \Illuminate\Contracts\Support\MessageBag
+     */
+    public function getMessageBag();
+}