For some reason, escaped double quotes in wxString::Format cause issues
on Mac. We can replace them with single quotes in most places without
loss of clarity
CHANGED: BOM generator plugins are no longer loaded by
searching all plugin directories; instead a
fixed default set of plugins is provided.
Also:
- Move from sexpr to JSON
- Support both full-path and no-path specifications of plugins
- Add a Reset to Defaults button to reset the list
Fixes https://gitlab.com/kicad/code/kicad/-/issues/7633
* On Windows, a python command line must be python <script_path>/script.py
and not python <script_path>\script.py
* Fix also a incorrect warning message when a script is not found.