GPS - improvements.

[arnoldandreasson]

The GPS/location part in Wurb-2024 is more or less just a copy from the Wurb-2020 version.

We need some more alternatives for user settings.

• Check box if GPS should set the detector time. This is not needed if the RTC in RPi 5 is used.
• Number of detected satellites needed to use GPS data. The fix value 3 is used in the old version.
• Time with stable GPS data before time is set and GPS position is used.
• Check box if "Last found GPS" should be cleared or remain at restart of the detector. Depends on if it is a stationary och mobile detector.
• Number of used decimals for latitude/longitude in the filenames for recordings.