Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Functional/AbstractFunctional.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Functional;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Shared\File;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Base class for functional test to write and reload file on disk across different formats.
+ */
+abstract class AbstractFunctional extends TestCase
+{
+    /**
+     * Write spreadsheet to disk, reload and return it.
+     *
+     * @param Spreadsheet $spreadsheet
+     * @param string $format
+     * @param null|callable $readerCustomizer
+     *
+     * @return Spreadsheet
+     */
+    protected function writeAndReload(Spreadsheet $spreadsheet, $format, callable $readerCustomizer = null)
+    {
+        $filename = tempnam(File::sysGetTempDir(), 'phpspreadsheet-test');
+        $writer = IOFactory::createWriter($spreadsheet, $format);
+        $writer->save($filename);
+
+        $reader = IOFactory::createReader($format);
+        if ($readerCustomizer) {
+            $readerCustomizer($reader);
+        }
+        $reloadedSpreadsheet = $reader->load($filename);
+        unlink($filename);
+
+        return $reloadedSpreadsheet;
+    }
+}