support offline maps mapforge

[nutpantz]

no everyone has data in the woods, or while traveling.
if would be great if offline maps were supported
mapforge maps seem the most popular for open source projects
https://github.com/mapsforge/mapsforge
the developers can build maps, or the user can build maps or the user can download precomplied maps that are built regularly

http://ftp-stud.hs-esslingen.de/pub/Mirrors/download.mapsforge.org/maps/

the maps support can be built in the app or with helper apps
( like opentracks did with osmdshboard)

https://github.com/OpenTracksApp/OSMDashboard