Icon request: OpenStreetMap (OSM)
## Icon

OpenStreetMap doesn't appear to have an official black-and-white icon, but there are a few b&w logos in https://wiki.openstreetmap.org/wiki/Logos that could be further simplified to be used as icons:

- https://wiki.openstreetmap.org/wiki/File:OSM_black.svg (CC-By-SA 2.0)
- https://wiki.openstreetmap.org/wiki/File:Logo_simple.svg (CC-By-SA 2.0)

## Name Suggestion

`openstreetmap`

## Use Case

In Liberapay we could use it to show that a connected account is an openstreetmap.org account, the same way we use the GitHub icon, the Mastodon icon, etc. In other projects an OSM icon might be useful as an alternative to the `map` and `map-o` icons, to represent a map based on OSM.

To be honest I'm not sure if adding an OSM icon is a good idea or not, but now that I've finished writing it down I might as well submit it…