Make global usage of use instead of FQCN

Closes #78
Closes #147

docs/Examples/Reader/exampleReader14.php

@@ -1,5 +1,9 @@
 <?php
 
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Reader\IReadFilter;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+
 error_reporting(E_ALL);
 set_time_limit(0);
 
@@ -24,8 +28,8 @@ require_once __DIR__ . '/../../../src/Bootstrap.php';
 $inputFileType = 'Csv';
 $inputFileName = './sampleData/example2.csv';
 
-/**  Define a Read Filter class implementing \PhpOffice\PhpSpreadsheet\Reader\IReadFilter  */
-class chunkReadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
+/**  Define a Read Filter class implementing IReadFilter  */
+class chunkReadFilter implements IReadFilter
 {
     private $_startRow = 0;
 
@@ -56,7 +60,7 @@ class chunkReadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
 
 echo 'Loading file ',pathinfo($inputFileName, PATHINFO_BASENAME),' using IOFactory with a defined reader type of ',$inputFileType,'<br />';
 /*  Create a new Reader of the type defined in $inputFileType  **/
-$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);
+$reader = IOFactory::createReader($inputFileType);
 
 echo '<hr />';
 
@@ -71,7 +75,7 @@ $reader->setReadFilter($chunkFilter)
           ->setContiguous(true);
 
 /*  Instantiate a new PhpSpreadsheet object manually  **/
-$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
+$spreadsheet = new Spreadsheet();
 
 /*  Set a sheet index  **/
 $sheet = 0;