Allowing OSM Notes to be visible as a switchable default

[Fizzie41]

Description

Currently, OSM Notes are only visible in iD by going into the Map Data tab & turning them on. If you then close that editing page, & open a new one, you have to turn Notes on again. This is very annoying when you are working through the list of outstanding Notes, & trying to resolve them!

Could this be enabled as a feature that can be turned on or off, but which then appears by default until you change the setting again?

Screenshots

[tordans]

This would be a great candidate to add to https://github.com/openstreetmap/iD/blob/develop/API.md as an URL Param as well.

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And likely something to tag as "good first issue", Martin.

[tordans]

For the iD Editor on OSM.org, we could also recognize on the Cookie _osm_location=13.4408|52.4738|16|MN where the N seems to save the on/off-state of the notes-overlay.

This would likely need to happen as part of the iframe-initializer on osm.org, see also openstreetmap/openstreetmap-website#3031.

[k-yle]

#8042 would fix this, but that PR has been open for over a year...

[tordans]

I will close this as a duplicate of #9312

The notes feature was improved a bit recently for the use case osmorg > editor, see #8042 (comment)