Allow to include shared photos on the map

[mvbjrn]

As a user that really enjoys the map view, I would like to be able to also see photos on the map that got shared with me. Additionally, I would like to be able to configure this behavior, so that I can toogle different map views, e.g. depending on the user that shared photos with me.

[aisbergde]

Good idea, but not all assets, but only assets, I marked (for example, if I could mark them as favorites. Or better: a function "add (virtually) to my library"