Add Simpson board support

solo/simpson/platformio.ini

@@ -0,0 +1,27 @@
+[env:Simpson_companion_solo]
+extends = Simpson
+board_build.ldscript = boards/nrf52840_s140_v6_extrafs.ld
+board_upload.maximum_size = 712704
+build_unflags = -Ofast -D OFFLINE_QUEUE_SIZE=256
+build_flags = ${Simpson.build_flags}
+  -I examples/companion_radio/ui-new
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D BLE_PIN_CODE=123456
+  -D DUAL_SERIAL=1
+  -D OFFLINE_QUEUE_SIZE=128
+  -D DISPLAY_CLASS=SH1106Display
+  -D FIRMWARE_SOLO_BUILD=1
+  -D UI_SENSORS_PAGE=1
+  -Os
+build_src_filter = ${Simpson.build_src_filter}
+  +<helpers/nrf52/SerialBLEInterface.cpp>
+  +<helpers/ui/SH1106Display.cpp>
+  +<helpers/ui/MomentaryButton.cpp>
+  +<helpers/ui/buzzer.cpp>
+  +<helpers/ui/GenericVibration.cpp>
+  +<../examples/companion_radio/*.cpp>
+  +<../examples/companion_radio/ui-new/*.cpp>
+lib_deps = ${Simpson.lib_deps}
+  adafruit/RTClib @ ^2.1.3
+  densaugeo/base64 @ ~1.4.0