RAK4631: BME680 add and GPS cleanup

- Added the BME680 environment sensor functionality
- Added the GPS Repeater env for those wanting it
- Cleaned up the GPS and other RAK4631SensorManager code

Verified build and functionality on normal and GPS repeater and companion envs.

IAQ readout is still a work in progress, but a placeholder can be seen on Channel 2 of the app telemetry.

variants/rak4631/platformio.ini

@@ -23,7 +23,6 @@ lib_deps =
   ${nrf52840_base.lib_deps}
   adafruit/Adafruit SSD1306 @ ^2.5.13
   stevemarple/MicroNMEA @ ^2.0.6
-  sparkfun/SparkFun u-blox GNSS Arduino Library @ ^2.2.27
 
 [env:RAK_4631_Repeater]
 extends = rak4631
@@ -41,6 +40,30 @@ build_src_filter = ${rak4631.build_src_filter}
   +<helpers/ui/SSD1306Display.cpp>
   +<../examples/simple_repeater>
 
+[env:RAK_4631_GPS_Repeater]
+extends = rak4631
+build_flags =
+  ${rak4631.build_flags}
+  -D DISPLAY_CLASS=SSD1306Display
+  -D ADVERT_NAME='"RAK4631 GPS Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=8
+  -D FORCE_GPS_ALIVE=1
+  -D ENV_INCLUDE_GPS=1
+  -D ENV_INCLUDE_BME680=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${rak4631.build_src_filter}
+  +<helpers/ui/SSD1306Display.cpp>
+  +<../examples/simple_repeater>
+lib_deps = 
+  ${rak4631.lib_deps}
+  sparkfun/SparkFun u-blox GNSS Arduino Library @ ^2.2.27
+  https://github.com/boschsensortec/Bosch-BSEC2-Library
+  https://github.com/boschsensortec/Bosch-BME68x-Library
+
 [env:RAK_4631_room_server]
 extends = rak4631
 build_flags =
@@ -104,6 +127,7 @@ build_flags =
   -D BLE_DEBUG_LOGGING=1
   -D OFFLINE_QUEUE_SIZE=256
   -D ENV_INCLUDE_GPS=1
+  -D ENV_INCLUDE_BME680=1
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${rak4631.build_src_filter}
@@ -112,6 +136,9 @@ build_src_filter = ${rak4631.build_src_filter}
   +<../examples/companion_radio>
 lib_deps =
   ${rak4631.lib_deps}
+  sparkfun/SparkFun u-blox GNSS Arduino Library @ ^2.2.27
+  https://github.com/boschsensortec/Bosch-BSEC2-Library
+  https://github.com/boschsensortec/Bosch-BME68x-Library
   densaugeo/base64 @ ~1.4.0
 
 [env:RAK_4631_terminal_chat]