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>

.github/workflows/main_matrix.yml

@@ -34,9 +34,8 @@ jobs:
           - board: heltec-v2.1
           - board: tbeam0.7
           - board: meshtastic-diy-v1
-          - board: rak4631_5005
-          - board: rak4631_19003
-          - board: rak4631_5005_eink
+          - board: rak4631
+          - board: rak4631_eink
           - board: t-echo
 
     runs-on: ubuntu-latest
@@ -158,9 +157,8 @@ jobs:
       max-parallel: 2
       matrix:
         include:
-          - board: rak4631_5005
-          - board: rak4631_19003
-          - board: rak4631_5005_eink
+          - board: rak4631
+          - board: rak4631_eink
           - board: t-echo
           - board: pca10059_diy_eink