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

variants/lora_isp4520/platformio.ini

@@ -0,0 +1,17 @@
+[env:lora_isp4520]
+extends = nrf52_base
+board = lora_isp4520
+
+# add our variants files to the include and src paths
+build_flags = ${nrf52_base.build_flags} -Ivariants/lora_isp4520
+
+# No screen and GPS on the board. We still need RTC.cpp for the RTC clock.
+src_filter = ${nrf52_base.src_filter} +<../variants/lora_isp4520> -<graphics> -<gps> +<gps/GPS.cpp> +<gps/RTC.cpp>
+lib_ignore = ${nrf52_base.lib_ignore} 
+  ESP8266_SSD1306
+  SparkFun Ublox Arduino Library
+  AXP202X_Library
+  TinyGPSPlus
+
+upload_protocol = jlink
+monitor_port = /dev/ttyUSB0