This moves some stuff to REPORTER APIs. Moving more stuff would be good,
but it probably too high-risk at present. We'll wait for 8.0 for that....
Fixes https://gitlab.com/kicad/code/kicad/issues/13359
Follow-up after the KIBIS and KIBIS GUI merge requests.
- Move KIBIS from Pcbnew to Eeschema space,
- Make KIBIS obtain the Ku/Kd coefficients via the `SPICE_SIMULATOR` class instead of calling the `ngspice` executable via `system()`,
- Allow to toggle between differential and single-ended model in the GUI,
- Various GUI fixes and improvements.