A bunch of cleanup and fixes.

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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