Read borer styles for table cells

[kernusr]

Is your feature request related to a problem? Please describe.

The specification says about cell border styles http:https://officeopenxml.com/WPtableCellProperties-Borders.php

But in Word2007 Reader There is nothing that could read these styles.

This is done for tables in method

PHPWord/src/PhpWord/Reader/Word2007/AbstractPart.php

Line 469 in 0af4ca1

protected function readTableStyle(XMLReader $xmlReader, DOMElement $domNode)

I suggest doing the same in method

PHPWord/src/PhpWord/Reader/Word2007/AbstractPart.php

Line 555 in 0af4ca1

private function readCellStyle(XMLReader $xmlReader, DOMElement $domNode)

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