Remove the wxPython dependency

[kurtmckee]

This PR introduces the following changes:

• Remove the wxPython code, examples, and Gui package extra

git blame shows that the smartcard.wx module was introduced 17 years ago, in 2007, and that the code itself has been largely untouched except to resolve linter warnings and update copyright years [example].

Therefore I'm suggesting to discard the wxPython code because it appears to be unmaintained code.

[coveralls]

coverage: 68.019% (+6.2%) from 61.833%
when pulling 44726ea on kurtmckee:rm-wx
into d276747 on LudovicRousseau:master.

[LudovicRousseau]

My problem is that I do not know if smartcard.wx is used or not by PySCard users.

Since the code is broken since some years I guess the answer is: no.

[kurtmckee]

I wasn't able to install wxPython on Linux after about two hours of effort, so I'm only stating that the smartcard.wx code doesn't appear to have been meaningfully updated in 17 years, and I'm recommending removing unmaintained code.

[LudovicRousseau]

sudo apt install python3-wxgtk4.0

[kurtmckee]

Nice! Thanks for suggesting that!

I'm going to be out for a while, so if you've installed wxPython and confirmed that smartcard.wx cannot be imported or run, then feel free to merge, otherwise I'll try testing installing from apt when I'm able to. 👍

[kurtmckee]

I ended up having an opportunity to install and try running the app in SimpleSCardApp.py and found that a window opened but didn't render anything. Eventually I received a KDE pop-up stating that the window wasn't responding and asking if I wanted to kill the process.

Based on the age of the smartcard.wx code and the experience described above, I recommend merging this PR.