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Simplify the code a bunch to reduce it to states we actually care
about. This will now probe my Logitech G105, NIZ Plum 85EC, and
Keyboard.io Model 01.
* Don't listen for wakeup interrupts. Only listen for device
connection and disconnection, which wakeups sometimes mean.
* Remove the SETTLE_DELAY stuff on device connection, as this
appears to be handled in hardware, and prevents over-delay which
was causing the Model 01 to reset, since it wasn't getting a SOF
in time.
* Set initial max packet size for address 0 endpoint 0 based on
whether the connection is Full Speed or Low Speed.
* Remove all intflag checks from USB handler that we don't
explicitly set up.
* Always listen dor dconn/ddisc in handler. Since we're using a ring
buffer for event storage, we shouldn't miss these and always
handle them in order.
* Don't freeze pipes on errors. Let the hardware do it.
* Don't retransmit packets on errors, just keep polling hardware.
* Move trfail check to the end, since it's either dependent on
previous, more specific checks, or it's just a NAK (but, for some
reason, not ERRORFLOW).
* Add `modify` method to control pipe register.
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