Release of v4.0.0-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/composer/autoload_psr4.php

@@ -1,13 +0,0 @@
-<?php
-
-// autoload_psr4.php @generated by Composer
-
-$vendorDir = dirname(dirname(__FILE__));
-$baseDir = dirname($vendorDir);
-
-return array(
-    'Psr\\SimpleCache\\' => array($vendorDir . '/psr/simple-cache/src'),
-    'PhpOffice\\PhpSpreadsheet\\' => array($vendorDir . '/phpoffice/phpspreadsheet/src/PhpSpreadsheet'),
-    'Matrix\\' => array($vendorDir . '/markbaker/matrix/classes/src'),
-    'Complex\\' => array($vendorDir . '/markbaker/complex/classes/src'),
-);