Particulate Matter App

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New features:
✓ Scan your local network for active sensors. To access this feature, go the to 'my sensors' tab and select the small grey button in the bottom right corner
✓ New 2x2 tiles homescreen widget
✓ Hungarian translation (thanks to Artúr Szilágyi)
✓ Settings option to turn off notifications
✓ Restore last viewport position and zoom on the map at app launch

Improvements:
✓ Many different bugfixes
✓ Translation fixes