Release of v5.0.0-rc1

Improved the Schema Table update engine (more). Fix autoloader timing, and loading. Implement the Joomla Powers in JCB code, to move away from JClasses.

libraries/phpspreadsheet/vendor/autoload.php

@@ -1,7 +0,0 @@
-<?php
-
-// autoload.php @generated by Composer
-
-require_once __DIR__ . '/composer/autoload_real.php';
-
-return ComposerAutoloaderInit6afe6fcd54e00add00a5fe0e5fb044f9::getLoader();