v0.6 - SDK 2.1.0

Update pico-sdk, picotools, pico-lib

• Pico-lib: rename PWM to PWM_channel
• Update can2040 to support pico-sdk 2.1.0
• Regenerate PIO files

Deployment

• New output folder for generated binaries out/
• Combined binary containing bootloader and application
• Scripts for mass flashing of devices auto_flash.sh
• Compilation of bootloader inside container