Improved GPS Settings app and GPS service (#222)

- Fixes and improvements to `GpsSettings` app, `GpsDevice` and `GpsService`
- Implemented location/GPS statusbar icon
- Added app icon
- Added support for other GPS models (based on Meshtastic code)

Data/system_sources/location.svg

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+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
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+     bordercolor="#eeeeee"
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+     inkscape:window-width="2560"
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Data/system_sources/sdcard.svg

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Data/system_sources/sdcard_alert.svg

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