Let cloneBlock support search-patterns in block

Support variable like cloneRow
in .docx
```
${BLOCK}
This is clone block ${NO} Name=${Name} Value=${Value}
Please test it.
${/BLOCK}
```

in .php

···
$testData = array(
    array('Name'=>'Test Name 1', 'Value'=>123.45),
    array('Name'=>'Test Name 2', 'Value'=>223.45),
    array('Name'=>'Test Name 3', 'Value'=>323.45),
    array('Name'=>'Test Name End', 'Value'=>423.45),
);

foreach ($testData as $n=>$v) {
    $templateProcessor->setValue('Name#'.($n+1), $v['Name']);
    $templateProcessor->setValue('Value#'.($n+1), $v['Value']);
}
```

Author: stxh

src/PhpWord/TemplateProcessor.php

@@ -256,7 +256,8 @@ public function cloneBlock($blockname, $clones = 1, $replace = true)
             $xmlBlock = $matches[3];
             $cloned = array();
             for ($i = 1; $i <= $clones; $i++) {
-                $cloned[] = $xmlBlock;
+                $newXmlBlock = preg_replace('/\$\{(.*?)\}/', '\${\\1#' . $i . '}', $xmlBlock);
+                $cloned[] = $newXmlBlock;
             }
 
             if ($replace) {