Add endstops, light_sensor, test, many fixes

- Added endstop and light_sensor module
 - Improved configuration by splitting wiring configs to boards.h
 - Added a unit test for argument parsing
 - Fixed many smaller bugs

platformio.ini

@@ -8,8 +8,35 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
-[env:nanoatmega328new]
+[env]
+monitor_speed = 115200
+framework = arduino
+test_build_project_src = true
+lib_deps =
+  adafruit/Adafruit TSL2591 Library @ ^1.3.1  
+  adafruit/Adafruit ADS1X15 @ ^2.1.1
+  adafruit/Adafruit BusIO @ ^1.7.3
+  SPI
+lib_ldf_mode = chain
+
+[env:nano]
 platform = atmelavr
 board = nanoatmega328new
-framework = arduino
-monitor_speed = 115200
+build_flags = -D MCU_NANO -lc
+
+[env:leonardo]
+platform = atmelavr
+board = leonardo
+monitor_speed = 115200
+build_flags = -D MCU_LEONARDO
+
+[env:pico]
+platform = raspberrypi
+board = pico
+build_flags = -D MCU_PICO
+
+[env:bluepill]
+platform = ststm32
+board = bluepill_f103c8
+upload_protocol = stlink
+build_flags = -D MCU_BLUEPILL