Convert escapers to singletons (#239)

src/Spout/Writer/XLSX/Helper/FileSystemHelper.php

@@ -284,7 +284,7 @@ EOD;
 EOD;
 
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
-        $escaper = new \Box\Spout\Common\Escaper\XLSX();
+        $escaper = \Box\Spout\Common\Escaper\XLSX::getInstance();
 
         /** @var Worksheet $worksheet */
         foreach ($worksheets as $worksheet) {

src/Spout/Writer/XLSX/Helper/SharedStringsHelper.php

@@ -49,7 +49,7 @@ EOD;
         fwrite($this->sharedStringsFilePointer, $header);
 
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
-        $this->stringsEscaper = new \Box\Spout\Common\Escaper\XLSX();
+        $this->stringsEscaper = \Box\Spout\Common\Escaper\XLSX::getInstance();
     }
 
     /**

src/Spout/Writer/XLSX/Internal/Worksheet.php

@@ -56,7 +56,7 @@ EOD;
         $this->shouldUseInlineStrings = $shouldUseInlineStrings;
 
         /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
-        $this->stringsEscaper = new \Box\Spout\Common\Escaper\XLSX();
+        $this->stringsEscaper = \Box\Spout\Common\Escaper\XLSX::getInstance();
 
         $this->worksheetFilePath = $worksheetFilesFolder . '/' . strtolower($this->externalSheet->getName()) . '.xml';
         $this->startSheet();