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.
- Some preliminary refactoring,
- Use multiple types for IBIS drivers instead of a wftype variable,
- Remove the m_requiresUIUpdate variable and its accessors.