Illumination support, change core, breaks hw serial

HW serial temporarily broken due to the change in pico core. This core
has a lot more features e.g. easily changing PWM frequency and supports
both pico cores (currently unused)

platformio.ini

@@ -31,10 +31,11 @@ board = leonardo
 monitor_speed = 115200
 build_flags = -D MCU_LEONARDO
 
-[env:pico]
-platform = raspberrypi
-board = pico
-build_flags = -D MCU_PICO
+;[env:pico]
+;platform = raspberrypi
+;board = pico
+;build_flags = -D MCU_PICO
+;upload_port = /media/filip/RPI-RP2
 
 [env:bluepill]
 platform = ststm32
@@ -54,4 +55,13 @@ build_flags =
 platform = espressif32
 board = esp-wrover-kit
 build_flags = -D MCU_ESP32
-monitor_filters = esp32_exception_decoder
+monitor_filters = esp32_exception_decoder
+build_type = debug
+
+[env:pico]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = pico
+framework = arduino
+board_build.core = earlephilhower
+upload_port = /media/filip/RPI-RP2
+build_flags = -D MCU_PICO