Add support for mc:AlternateContent

Author: ahrens-sven

.gitignore

@@ -21,3 +21,6 @@ phpword.ini
 /.project
 /nbproject
 /.php_cs.cache
+docker-compose.yml
+/phpdocker
+/public

src/PhpWord/Reader/Word2007/AbstractPart.php

@@ -292,6 +292,19 @@ protected function readRunChild(XMLReader $xmlReader, \DOMElement $node, Abstrac
             $parent->addTextBreak();
         } elseif ($node->nodeName == 'w:tab') {
             $parent->addText("\t");
+        } elseif ($node->nodeName == 'mc:AlternateContent') {
+            $hasChildren = $node->childNodes->length > 0;
+            
+            if ($hasChildren) {
+                $origin = $node->childNodes->item($node->childNodes->length - 1);
+
+                if ($origin->nodeValue) {
+                    // TextRun
+                    $textContent = htmlspecialchars($origin->nodeValue, ENT_QUOTES, 'UTF-8');
+
+                    $parent->addText($textContent, $fontStyle, $paragraphStyle);
+                }
+            }
         } elseif ($node->nodeName == 'w:t' || $node->nodeName == 'w:delText') {
             // TextRun
             $textContent = htmlspecialchars($xmlReader->getValue('.', $node), ENT_QUOTES, 'UTF-8');