Use strsep for NMEA message tokenization

strtok doesn't parse correctly following message:

  $GPGSA,A,1,,,,,,,,,,,,,,,*1E

Resulting in "datagram has wrong parameter count".

Signed-off-by: Petr Štetiar <[email protected]>

Bail out if we can't find GPS device

Signed-off-by: Petr Štetiar <[email protected]>

Switch to ulog for logging and add few commandline params

Signed-off-by: Petr Štetiar <[email protected]>

cmake: Add proper library and include files search logic for dependecies

Signed-off-by: Petr Štetiar <[email protected]>

lat/lng format when printing is incorrect

Signed-off-by: Maurice-Jörg Nießen <[email protected]>

typo fix

Signed-off-by: Maurice-Jörg Nießen <[email protected]>

Import