WIP: unify the RAK targets into one firmware (#1350)

* First steps to unify GPS Lib for RAK 1910 and RAK 12500

* Technicalities. Out with the old and build the new.

* Adapt Matrix

* We use 0.4.5 now

* While we're at it, yank the RAK815, it's EOL

* Satisfy CI - for now

* - yank UBX library, talk to GPS chip with NMEA only.
- more autodetect going on, this time for the Eink Display.

TODO: actually do something with the scan findings.

* i swear this works on windows! :-)

* these are only there to make CI happy

* don't update eink display if not detected.

* Replace Oberon Crypt Library with modified Adafruit Library. This elimintaes the need for the sdk-nfxlib submodule.

* - Revert auto screen selection (incomplete)
- Revert nrF crypto engine (needs more work)
- add separate defines for not-auto-selecting screen lib.

* Define 2 new variants for RAK - with or without epaper

* Update variants

Co-authored-by: Sacha Weatherstone <sachaw100@hotmail.com>
Co-authored-by: Ben Meadors <thebentern@tuta.io>

src/gps/GPS.cpp

@@ -16,12 +16,6 @@ HardwareSerial *GPS::_serial_gps = &Serial1;
 HardwareSerial *GPS::_serial_gps = NULL;
 #endif
 
-#ifdef GPS_I2C_ADDRESS
-uint8_t GPS::i2cAddress = GPS_I2C_ADDRESS;
-#else
-uint8_t GPS::i2cAddress = 0;
-#endif
-
 GPS *gps;
 
 /// Multiple GPS instances might use the same serial port (in sequence), but we can
@@ -325,10 +319,6 @@ int GPS::prepareDeepSleep(void *unused)
     return 0;
 }
 
-#ifdef GPS_TX_PIN
-#include "UBloxGPS.h"
-#endif
-
 #ifndef NO_GPS
 #include "NMEAGPS.h"
 #endif
@@ -345,25 +335,9 @@ GPS *createGps()
 #else
         DEBUG_MSG("Using MSL altitude model\n");
 #endif
-// If we don't have bidirectional comms, we can't even try talking to UBLOX
-#ifdef GPS_TX_PIN
-        // Init GPS - first try ublox
-        UBloxGPS *ublox = new UBloxGPS();
-
-        if (!ublox->setup()) {
-            DEBUG_MSG("ERROR: No UBLOX GPS found\n");
-            delete ublox;
-            ublox = NULL;
-        } else {
-            DEBUG_MSG("Using UBLOX Mode\n");
-            return ublox;
-        }
-#endif
-
         if (GPS::_serial_gps) {
             // Some boards might have only the TX line from the GPS connected, in that case, we can't configure it at all.  Just
             // assume NMEA at 9600 baud.
-            DEBUG_MSG("Using NMEA Mode\n");
             GPS *new_gps = new NMEAGPS();
             new_gps->setup();
             return new_gps;