GPSies

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Because GPSies has just a little revenue (it's just my personal hobby), I'm asking for indulgence with regard to the further development ;-). This update does not include new features, it's just a security update and an adaptation to the latest Android requirements.

- preperation for Android 8 (O)
- all server communications changed to SSL (HTTPS)
- opt-in for disclaimer added
- API key for OpenCycleMaps added (logged in user only)
- small bug fixes and performance optimation