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Using all the work from @hfellner and others, add FreeRTOS
SMP support.

Allow idling cores through the FreeRTOS FIFO queue to
allow for file system and EEPROM support.

Make delay a weak function so FreeRTOS can override.

Add cycle count support under FreeRTOS using a PIO SM.

Use a task-based approach for handling the USB periodic work
instead of the IRQ-based one in the main core.

Set 8 prio levels so it fits in 3 bits nicely (0..7).