Add ability to manage header & footer height

[JillElaine]

The code to do this is here: https://phpword.codeplex.com/discussions/316726
Here is the related 'workitem' on the phpWord site: https://phpword.codeplex.com/workitem/35

[Progi1984]

The feature has been added in the develop branch.

[jcnolan]

Note, successfully tested in v0.13.0 to place 8.5" x 11" image as watermark on micro-perf stock template.

   $PidPageSettings = array(
            'headerHeight'=> \PhpOffice\PhpWord\Shared\Converter::inchToTwip(.2),
            'footerHeight'=> \PhpOffice\PhpWord\Shared\Converter::inchToTwip(.2),
            'marginLeft'  => \PhpOffice\PhpWord\Shared\Converter::inchToTwip(.75),
            'marginRight' => \PhpOffice\PhpWord\Shared\Converter::inchToTwip(.75),
            'marginTop'   => 0,
            'marginBottom'=> 0,
        );

        $section = $this->phpword->createSection($PidPageSettings);
        $header = $section->addHeader();

        $foo = array(
            'width'            => \PhpOffice\PhpWord\Shared\Converter::inchToPixel(8.5),
            'height'           => \PhpOffice\PhpWord\Shared\Converter::inchToPixel(11),
            'positioning'      => \PhpOffice\PhpWord\Style\Image::POSITION_ABSOLUTE,
            'posHorizontal'    => \PhpOffice\PhpWord\Style\Image::POSITION_HORIZONTAL_CENTER,
            'posHorizontalRel' => \PhpOffice\PhpWord\Style\Image::POSITION_RELATIVE_TO_PAGE,
            'posVerticalRel'   => \PhpOffice\PhpWord\Style\Image::POSITION_RELATIVE_TO_PAGE,
        );

        if ($fName) $header->addWatermark($fName, $foo); // $fName would be your 8.5" x 11" image

Was using PHPWord to create documents to be printed on micro-perforated card stock and was placing a scan of the template as a watermark for debugging purposes and required a .2" header / footer. The following proceeding code worked but ALL values needed to be set to create a properly working document.