Split platformio.ini into one file for each board, only leaving platform definitions and a handful of stale (?) boards around.. (#1141)

variants/portduino/platformio.ini

@@ -0,0 +1,37 @@
+; The Portduino based sim environment on top of any host OS, all hardware will be simulated
+[env:native]
+platform = https://github.com/geeksville/platform-native.git 
+src_filter = 
+  ${env.src_filter} 
+  -<esp32/> 
+  -<nimble/> 
+  -<nrf52/> 
+  -<mesh/http/> 
+  -<plugins/esp32>
+  -<plugins/EnvironmentalMeasurementPlugin.cpp*>
+  +<../variants/portduino>
+build_flags = ${arduino_base.build_flags} -O0 -I variants/portduino
+framework = arduino
+board = cross_platform
+lib_deps =
+  ${arduino_base.lib_deps}
+  rweather/Crypto
+
+; The Portduino based sim environment on top of a linux OS and touching linux hardware devices
+[env:linux]
+platform = https://github.com/geeksville/platform-native.git 
+src_filter = 
+  ${env.src_filter} 
+  -<esp32/> 
+  -<nimble/> 
+  -<nrf52/> 
+  -<mesh/http/> 
+  -<plugins/esp32>
+  -<plugins/EnvironmentalMeasurementPlugin.cpp*>
+  +<../variants/portduino>
+build_flags = ${arduino_base.build_flags} -O0 -lgpiod -I variants/portduino
+framework = arduino
+board = linux_hardware
+lib_deps =
+  ${arduino_base.lib_deps}
+  rweather/Crypto