Implemented some more client side spoolss functions:

Implemented some more client side spoolss functions:

 - getprinterdataex(), setprinterdataex(), enumprinterdataex()

Pass data type down to setprinterdata() fn instead of hardcoding REG_SZ.

Did some trickyness to get enumprinterdataex replies unmarshalled
properly.  The code seems to have been written to require the number
of entries returned before unpacking said entries.  Skip to the end of
the response and read the number of entries then jump back and process
the printer data.