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/main.cpp

@@ -24,6 +24,7 @@
 #include "shutdown.h"
 #include "target_specific.h"
 #include "debug/i2cScan.h"
+#include "debug/einkScan.h"
 #include "debug/axpDebug.h"
 #include <Wire.h>
 // #include <driver/rtc_io.h>
@@ -78,6 +79,8 @@ uint8_t cardkb_found;
 // The I2C address of the Faces Keyboard (if found)
 uint8_t faceskb_found;
 
+bool eink_found = true;
+
 uint32_t serialSinceMsec;
 
 bool axp192_found;
@@ -208,6 +211,9 @@ void setup()
 #endif
 
     scanI2Cdevice();
+#ifdef RAK4630
+    // scanEInkDevice();
+#endif
 
     // Buttons & LED
     buttonThread = new ButtonThread();