Provide descriptions against FCDOs and FCDAs in dataset view and picker (closes #6)

[danyill]

Closes #6. See #6 for some screenshots of the current state to allow discussion of how to meet this goal.

We can also decide if this is an appropriate way to show descriptions.

I've decided:

• Not to use type descriptions
• Not to use the <DAI name="d">, VSD, nsdocs or others...

I finished the DA picker to illustrate the change but would need to do more:

• [x] Transfer approach to DO picker since the code is duplicated.
• [x] Decide how to show descriptions in constrained space for GOOSE/SV/Report editors (currently results in misalignment)
• [ ] Decide how to truncate descriptions in picker (can we add labels somehow or a second line?)
• [ ] Add unit tests
• [ ] Add screenshot tests

As part of a drive by I also:

• corrected the names which were identical for the DO and DA attribute pickers
• added the FC to the DA attribute name in the picker

Happy to split these out as required.

[danyill]

hi @JakobVogelsang WDYT about this? Can we discuss a little if this is an acceptable approach and practical within our current UI?

[danyill]

This doesn't seem to be terribly far away:

In a space constrained environment the icons are not matching very well:

Which I can fix in the browser with: