Not all parts of a RMC sentence are parsed

[elpiel]

After the fix in the documentation of RMC sentences #57 we've realized there are missing parts of the parsing of those sentences.

In particular the parsing of parts after the date is missing, i.e.:

Parsing that is missing

10. Magnetic Variation, degrees
11. E or W
12. FAA mode indicator (NMEA 2.3 and later)
13. Nav Status (NMEA 4.1 and later)
    A = autonomous, D = differential, E = Estimated,
    M = Manual input mode, N = not valid, S = Simulator, V = Valid

Testing

Make sure to test for all fields variations, more specifically 3 different versions of the sentence:

• Pre- NMEA 2.3
• NMEA 2.3 (with FAA mode)
• NMEA 4.1 (with Nav status)

[elpiel]

Fixed in #66