BLE Testing

BLE support for BLE-only and dual-mode devices like Mobilinkd TNC3/TNC4.

Full Changelog: https://github.com/mobilinkd/aprsdroid/commits/MOBILINKD_BLE

Please note: maps do not work in the attached APK because of a missing API key. If you want to test with maps enabled, you will need to build the APK yourself, following the build instructions for updating the API key.