Reorganize Samples

The samples have become unwieldy when running them from a browser. In particular, the drop-down lists are fixed size with no scrolling, and many of them are now just too large. I have moved all the Calculation samples up a level, and broken several categories (Basic, Chart, DateTime, Engineering, Financial, and Reader) into several pieces.

Convert-Online (now found in the Engineering category) had a number of different problems which are now resolved. It is the only member with any significant code change.

samples/Basic2/23_Sharedstyles.php

@@ -0,0 +1,59 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Border;
+use PhpOffice\PhpSpreadsheet\Style\Fill;
+use PhpOffice\PhpSpreadsheet\Style\Style;
+
+require __DIR__ . '/../Header.php';
+
+// Create new Spreadsheet object
+$helper->log('Create new Spreadsheet object');
+$spreadsheet = new Spreadsheet();
+
+// Set document properties
+$helper->log('Set document properties');
+$spreadsheet->getProperties()->setCreator('Maarten Balliauw')
+    ->setLastModifiedBy('Maarten Balliauw')
+    ->setTitle('Office 2007 XLSX Test Document')
+    ->setSubject('Office 2007 XLSX Test Document')
+    ->setDescription('Test document for Office 2007 XLSX, generated using PHP classes.')
+    ->setKeywords('office 2007 openxml php')
+    ->setCategory('Test result file');
+
+// Add some data
+$helper->log('Add some data');
+$spreadsheet->setActiveSheetIndex(0);
+
+$sharedStyle1 = new Style();
+$sharedStyle2 = new Style();
+
+$sharedStyle1->applyFromArray(
+    ['fill' => [
+        'fillType' => Fill::FILL_SOLID,
+        'color' => ['argb' => 'FFCCFFCC'],
+    ],
+        'borders' => [
+            'bottom' => ['borderStyle' => Border::BORDER_THIN],
+            'right' => ['borderStyle' => Border::BORDER_MEDIUM],
+        ],
+    ]
+);
+
+$sharedStyle2->applyFromArray(
+    ['fill' => [
+        'fillType' => Fill::FILL_SOLID,
+        'color' => ['argb' => 'FFFFFF00'],
+    ],
+        'borders' => [
+            'bottom' => ['borderStyle' => Border::BORDER_THIN],
+            'right' => ['borderStyle' => Border::BORDER_MEDIUM],
+        ],
+    ]
+);
+
+$spreadsheet->getActiveSheet()->duplicateStyle($sharedStyle1, 'A1:T100');
+$spreadsheet->getActiveSheet()->duplicateStyle($sharedStyle2, 'C5:R95');
+
+// Save
+$helper->write($spreadsheet, __FILE__);