Heltec TTN Mapper

Summary

Remix of this well designed case https://www.thingiverse.com/thing:4729713 by mak0t0san to fit a slightly larger battery, a small slide switch, and some extra room for a GPS module.

I'm using this case as a TTN Mapper, along with code from https://github.com/ricaun/esp32-ttnmapper-gps.