Custom Options for EDS file

[FedericoSpada]

Vector CANeds tool groups all unknown options contained in an EDS File in a dedicated section called "Unknown Entries".
We use that section to save additional information that is not considered by the CANopen specifications (for example: unit, factor, offset, category, etc.), and so I had to modify this library to read and write those options.

If you open a file that contains unknown option names, they will be grouped in the "custom_options" dictionary.
If you desire to save a value with a specific option name, you can update the "custom_options" dictionary accordingly.

P.S.: In the meantime, I've improved some of the bad code.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
canopen/objectdictionary/eds.py	89.47%	1 Missing and 1 partial ⚠️

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