Include piccolo's start-up message

Add a note about handling TASK_TRANSFER events

Add a weak main() method to picousb.c

Rename status_t -> device_speed_t

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Create piccolo.md

These might not need to be queued?

Should work now

Cleaner timing but broken, fix now

Remove some debugging output

Update polling

Update usb-overview.md

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Adjust figcaption's

Enhance the Hierarchy section

Add a USB Hierarchy section

Add a little space after showing the driver check

Prepare for drivers

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