Fixes and updates

[CristiFati]

The main one is setting functions argtypes and restype. Modern Python versions raise an exception:

Traceback (most recent call last):
  File "..\..\GitHub\CristiFati\code\recipes\Python\305690_Enumerate_printer_job\recipe-305690.py", line 194, in <module>
    prt.EnumJobs(pJob, prt.pcbNeeded)
  File "..\..\GitHub\CristiFati\code\recipes\Python\305690_Enumerate_printer_job\recipe-305690.py", line 164, in EnumJobs
    ret = ws.EnumJobsA(self.OpenPrinter(),
ctypes.ArgumentError: argument 5: <class 'OverflowError'>: int too long to convert

preventing funky Undefined Behaviors: [SO]: C function called from Python via ctypes returns incorrect value (@CristiFati's answer).

I'm not sure how some of the code worked (if it did). Still uncertain about ReadPrinter part.

There are other problems to be addressed:

• Some harcodings (int values)
• Error checking (via GetLastError)
• Some structures are out of date