compose: Add button to share geolocation

[chrisbobbe]

Requested in chat: #mobile > Share user's location @ 💬

Is there a plan to support posting/sharing a user's location to a topic from the mobile app? I envision this could be similar to the attach file/image/photo buttons in the compose message box. A user could click a 'share location' button, which would add a link to the location on the map (GPS coordinates). Our community is composed of sailors scattered across the world, and we like to be able to quickly share location with others, for safety reasons as well as a reference when reporting information specific to certain places. Having this capability built into the app would be an excellent enhancement for us.

This, of course, would require asking for "location permission" on the phone, but I think this could be requested on a first use of the "share location" feature, which would only show up for users who want to use this.

I searched through the topics here and issues on GitHub, and it seems that it is not being tracked. However, if I missed it, please let me know.

Related issues:

• #1000