Experimental Serial GPS parser

[giovanni97bs]

I tried to implement a slightly modified NMEA parser library for standard GPS and GNSS data (MicroNMEA) into speeduino. For testing purpose i only added the GPS data to the auxiliary data (last 6 channels) and did no modifications to config pages. On atmega2560 (if uncommented) the parser add ~180 bytes of RAM usage (3%) and also 3% of FLASH usage.

This is more of a proof of concept if others may be interested in GPS data and will work on it more during the summer.

I chose Serial GPS connection because it is dirt cheap to get a standalone module and there are no availability issues.

For now i added only Latitude, Longitude, Altitude and speed to the log but the MicroNMEA library can also get Date/Time, Heading ecc.