Add support for css display:block and display:inline

[robert777robert777]

Please describe the new functionality as best as you can.

Add support for css display:block and display:inline .
The goal is to be able to do styling of div as span and etc... (without the need to modify the html)
I guess it should be relatively easy to implement since those layouts are already implemented in html

[finwe]

Please note https://github.com/mpdf/mpdf#about-css-support-and-development-state