Add second constructor and reorder constructor parameters to match
other USB classes. Also remove the ready() function since there
are no calls that can only mbe made from a ready state.
Remove the endpoint parameter from endpoint callbacks. This
information is redundant because endpoints are known at
construction time because they must be in the configuration
descriptor.
Make the following fixes:
-deinit in destructor to prevent race conditions
-cancel the reset task before calling it since it may be in progress
-wait for tasks to complete without mutex held
-prevent double connect with _init flag
Russ Butler