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/Basic4/44_Worksheet_info.php

@@ -0,0 +1,29 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx as Reader;
+use PhpOffice\PhpSpreadsheet\Writer\Xlsx as Writer;
+
+require __DIR__ . '/../Header.php';
+
+// Create temporary file that will be read
+$sampleSpreadsheet = require __DIR__ . '/../templates/sampleSpreadsheet.php';
+$filename = $helper->getTemporaryFilename();
+$writer = new Writer($sampleSpreadsheet);
+$writer->save($filename);
+
+$inputFileType = IOFactory::identify($filename);
+$reader = new Reader();
+$sheetList = $reader->listWorksheetNames($filename);
+$sheetInfo = $reader->listWorksheetInfo($filename);
+
+$helper->log('File Type:');
+var_dump($inputFileType);
+
+$helper->log('Worksheet Names:');
+var_dump($sheetList);
+
+$helper->log('Worksheet Names:');
+var_dump($sheetInfo);
+
+unlink($filename);