Change the initial inspector of the sidebar upon feature selection

[quincylvania]

Old behavior: The preset list is shown when selecting a feature without tags (except area=yes) and that is not member of a relation. Otherwise show the editor.

New behavior: The preset list is shown when selecting a new feature or a vertex without tags. Otherwise show the editor.

[bhousel]

Sounds good to me!
Also nice to rename isUsed() to something more descriptive.

[slhh]

@quincylvania I didn't like the old behavior in case of vertexes, but the new behavior makes it worse. E.g. it breaks the easy editing of turn restrictions.

I would show the preset list when assigning a preset is really required, and show the editor otherwise.
E.g.
New feature -> show the preset list
Existing feature without tags and relations (doesn't make sense without assigning a preset)-> show the preset list
vertex (assigning a preset is not mandatory) -> show the editor

This would make a shown preset list to be an indicator that the preset needs to be assigned. Currently it is not, because it neeeds to be ignored for vertexes in most cases.

[quincylvania]

@slhh Thanks for your feedback! Good point about the turn restriction editor. In 97c2361 I changed it back to showing the editor by default for intersection vertices.

Even though a vertex doesn't "need' tags, I think initially showing the preset list serves the primary use case of wanting to upgrade an untagged vertex to a specific preset.

The new behavior of initially showing the editor when selecting preexisting non-vertex features was changed in anticipation of upcoming validation UI.