GPS Rocket Locator

Jun 23, 2020

- a new option is added to settings (enabled only for API 19+): "Use Bluetooth LE"
- a Bluetooth LE GPS manager was implemented to handle incoming NMEA "notifications" through the custom (general purpose) FFE0 GATT service
- improved NMEA parser to handle GALILEO, GLONASS and multi provider too
- store the tile cache as ".dat" files instead of ".png" so the Album/Photos apps won't display these
- use the standard cache folder for the tile cache by default