splitPDF.py no longer works with macOS 12.3+

[grantbarrett]

As Apple has removed Python 2.x from the OS, the import of CoreGraphics in the script no longer works. First you have to install a version of Python 2.x to even get the error (which is outside of the scope of this ticket), but when you do:

from CoreGraphics import *
ImportError: No module named CoreGraphics

[grantbarrett]

To add to this, in response to the note on this repository's main page, changing

from CoreGraphics import *

to

from Quartz import *

after installing PyObjC creates a new problem.

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/objc/_lazyimport.py", line 154, in __getattr__
  raise AttributeError(name)
AttributeError: Swift.__VaListBuilder