UI enhancements

[kingofpayne]

No description provided.

[mmouchous-ledger]

Ok for changes, some extra things to do:

• make the cursor position to have fixed size
• add "label" in configuration scheme

[mmouchous-ledger]

I made the changes and additional UI Enhancement, could you please confirm before explicit approval?

• Viewer's mode (PIN / MOVE / ZONE) selection is unset when button is pressed again (should we also do the same behavior with shortcuts?)
• config.yaml file has the "label" field is attached to any "instrument" object (probe, camera, laser, ...)
• Zoom toolbars's label indicating cursor position is monospaced and have fixed width

[kingofpayne]

should we also do the same behavior with shortcuts?
I would say no, otherwise the user may disable using the shortcut while believing it is enabling it.