[Enhancement] map/location view of photos

[oliverrahner]

As mentioned in #1050, I am switching from DS Photo to Lychee.

Another feature I miss is to view photos by location, from a map view at best.
Additionally, filtering for tags, time, albums should be possible.

I'm thinking about hacking together some sort of solution for Lychee only for myself but decided to check if other people needed this as well, and then maybe put in some more effort.

[ildyria]

Another feature I miss is to view photos by location, from a map view at best.

I think we have the map support. O.o

More filtering need to be implemented though.