Better support for multiple multiplexing switches

[jstroem]

Does also add support for SG_MUL_VAL_ defs

[tomrijntjes]

I would appreciate this feature very much. Is there anything I can do?

edit: merging main works fine without conflicts. I'm not sure how to reproduce the linter issue mentioned above.

[bryanjhv]

@tomrijntjes something like this.

go run go.einride.tech/can/cmd/cantool lint <file-or-dir>

[RangelReale]

In the python cantools tests, there is a dbc file with a list of multiplex ranges in the SG_MUL_VAL_ message. Is there a documentation of this format?

[Jassob]

Hello @RangelReale, we've used http://www.mcu.so/Microcontroller/Automotive/dbc-file-format-documentation_compress.pdf as reference.

You can cross-reference it for information about SG_MUL_VAL_.

[Jassob]

@jstroem Please confirm if you're still interested in getting this PR merged, otherwise we'll close it in 14 days unless someone adopts it until then.