Initial implementation of app.popUpMenu
Based on popUpMenuEx, the implementation converts arguments to app.popUpMenuEx format and then call app.okular_popUpMenuEx.
app.popUpMenu is used in Altium Designer and EasyEDA exported PDFs. See an example here: https://www.st.com/en/evaluation-tools/32f723ediscovery.html#cad-resources https://www.st.com/resource/en/schematic_pack/mb1260-f723e-d03_schematic.pdf