Streetcomplete: add setting for selecting map style

[matkoniecz]

With proof-of-concept in https://github.com/ENT8R/streetcomplete-mapstyle/commit/d3479d2884d81e72d940ebd319f86420055e5f34 it makes sense to have at least option for at least two map styles

• https://github.com/ENT8R/streetcomplete-mapstyle in standard map version
• https://github.com/ENT8R/streetcomplete-mapstyle in satellite image version
• maybe also give option to use cinnabar, current map style
• maybe also other map styles (maybe cyclist-focused one? That would for example show which streets are oneway?)
• not sure how many people would use that but option of providing URL pointing to location of map style, allowing for style modification without recompiling app may be an interesting idea

It may be a good idea that once some usable version of https://github.com/ENT8R/streetcomplete-mapstyle is made then it would be available as option, with cinnabar remaining as default for start (and later default switching to streetcomplete-mapstyle)

[westnordost]

Yes, maybe, but switching the stylesheets has low priority for me. Though, I won't want to keep cinnabar around once a custom (set of) stylesheets is around.

[rugk]

…and a "dark/night" mode https://github.com/westnordost/StreetComplete/issues/198

[rugk]

Just add it as a settings entry. Maybe also add "Auto" there, which automatically switches to the dark mode at night.

[rugk]

Hint: What about "satellite image version" now?

[ENT8R]

Still tracked with #56