* Use the exactly same routines to deliver png images that are used in
mathml mode.
* Change the output to use mathoids png image rather than the mathml
and svg output.
* Locally tested on Firefox and Chrome: Depending on the mode either
the SVG or the PNG path is used.
Bug: T74240
Change-Id: I4b1cac92eb9a02190f316faab6621940951603d5
Moritz Schubotz (physikerwelt)