Add new Vehicle.CurrentLocation.Coordinates

[elffjs]

This has a new custom struct type, denoted by Types.DIMO.Coordinates. When I run

make venv
source .venv/vss-tools/bin/activate
make csv

I get some new rows:

"Node","Type","DataType","Deprecated","Unit","Min","Max","Desc","Comment","Allowed","Default","Id"
"Vehicle.CurrentLocation.Coordinates","sensor","Types.DIMO.Coordinates","","","","","Current location of the vehicle in WGS 84 coordinates.","","","","7fe502d879175cd5a85353d036e47a66"
"Types.DIMO.Coordinates","struct","","","","","","A struct datatype representing GNSS position.","","","","eda1e3476a3f5bda868c618c26654a2b"
"Types.DIMO.Coordinates.Latitude","property","double","","degrees","-90","90","Latitude in WGS 84 coordinates.","","","","92623867ef575aad848a8ad87f30ac2a"
"Types.DIMO.Coordinates.Longitude","property","double","","degrees","-180","180","Longitude in WGS 84 coordinates.","","","","37bd9a0850205a01b3f31a09e4bb7a1c"
"Types.DIMO.Coordinates.HDOP","property","double","","ratio","0","","Horizontal dilution of position. May be zero if this was not measured.","","","","53fd9d707b1153e796f4a65e21c9808b"

That first non-header row is the one we really want. I don't plan to create a general VSS struct → Go struct regime.

[linear]

PR-3852 VSS package field for location