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/Reader2/22_Reader_formscomments.php

@@ -0,0 +1,22 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+
+require __DIR__ . '/../Header.php';
+
+$helper->log('Start');
+
+$inputFileType = 'Xlsx';
+$inputFileName = __DIR__ . '/sampleData/formscomments.xlsx';
+
+$helper->log('Loading file ' . $inputFileName . ' using IOFactory with a defined reader type of ' . $inputFileType);
+$reader = IOFactory::createReader($inputFileType);
+$helper->log('Loading all WorkSheets');
+$reader->setLoadAllSheets();
+$spreadsheet = $reader->load($inputFileName);
+
+// Save
+$helper->write($spreadsheet, __FILE__, ['Xlsx']);
+$spreadsheet->disconnectWorksheets();
+
+$helper->log('end');