[andino_firmware] Enhance compiler safety warnings and integrate cppcheck static analysis (#330)

Signed-off-by: Javier Balloffet <javier.balloffet@gmail.com>

Author: jballoffet

andino_firmware/platformio.ini

@@ -16,6 +16,12 @@ default_envs = uno, nanoatmega328
 build_flags =
   -I include
   -Wall -Wextra
+  -Wshadow
+  -Wdouble-promotion
+check_tool = cppcheck
+check_skip_packages = yes
+check_flags =
+  cppcheck: --enable=style,performance,portability --inline-suppr --suppress=missingIncludeSystem
 
 ; Base configuration for Atmel AVR based Arduino boards.
 [base_atmelavr]