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/Basic1/12_CellProtection.php

@@ -0,0 +1,47 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Protection;
+
+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('Mark Baker')
+    ->setLastModifiedBy('Mark Baker')
+    ->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);
+$spreadsheet->getActiveSheet()->setCellValue('A1', 'Crouching');
+$spreadsheet->getActiveSheet()->setCellValue('B1', 'Tiger');
+$spreadsheet->getActiveSheet()->setCellValue('A2', 'Hidden');
+$spreadsheet->getActiveSheet()->setCellValue('B2', 'Dragon');
+
+// Rename worksheet
+$helper->log('Rename worksheet');
+$spreadsheet->getActiveSheet()->setTitle('Simple');
+
+// Set document security
+$helper->log('Set cell protection');
+
+// Set sheet security
+$helper->log('Set sheet security');
+$spreadsheet->getActiveSheet()->getProtection()->setSheet(true);
+$spreadsheet->getActiveSheet()
+    ->getStyle('A2:B2')
+    ->getProtection()->setLocked(
+        Protection::PROTECTION_UNPROTECTED
+    );
+
+// Save
+$helper->write($spreadsheet, __FILE__);