Sun Sep 1 11:44:47 EDT 2013

Setup requests + multiple packets

The CDC ACM configuration descriptor is 67 bytes, so we need to
implement multiple IN packets first.

Since all control requests are handled from the ISR, this needs a
different approach.  Solution is a state machine.

First packet: IN/DATA1, next packets: IN/DATA+

EDIT: Less than 67 bytes?  Maybe DFU was included?