* Optimise GPS Baud Rate cycle
Previously, our baud rate cycled through one list twice.
There were some rarer baudrates in there, so this code
separates out those into a dedicated list that is only
run through if detection fails for common bauds. We also
only run through each baud rate once.
* Fix first time around bug
Would have always reset GPS baudrate every time.
* Add support for fixing GPS_BAUDRATE
If GPS_BAUDRATE is set in variant.h, the deployer knows something we
don't about the GPS. Used especially when the GPS is soldered to a board
in a commercial product :) If we see that, we don't try other baud rates
at all.
* Don't print blank lines in GPS_DEBUG.
* Try GPS_BAUDRATE first, not only.
* Fix spelling mistakes in comments
* Only use GPS_BAUDRATE if specified in variant.h
* Modify RareSerial Speeds based on FIXED or not.
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