GPS support

[BrentonPoke]

Describe at a high level the solution you're providing
Supporting GPS in-house through TinyGPS++ with an intuitive API.

Is this a patch, a minor version change, or a major version change
minor.

Is this related to an open issue?
#311

Additional context
WIP right now

[BrentonPoke]

Decided to bring the printData() helper function internal and use the DuckLogger interface since there seemed to be some confusion about its purpose. It was originally intended for the developer to use at will without having to use debug flags. It now uses the debug log level and people will just have to enable debugging for everything if they want to see the printout.

[BrentonPoke]

#if defined(CDPCFG_GPS_RX) && defined(CDPCFG_GPS_TX)
#include <DuckGPS.h>
#endif

This is how the preprocessor guards are going to be used in cdpcfdg.h after the board definition section. It'll look for the receive and transmit pin definitions to determine whether to auto-include GPS stuff. I also added a preprocessor guard on one of the initializers that take from the board config. This way people can still use the DuckGPS API if they define the pins themselves.