Python 3 Support

[Evidlo]

I worked a bit on adding Python3 and wxPython4 support. If you make a python3 branch, I'll submit a PR so others can test it.

[rhertzog]

Python 2.x will no longer be supported by their upstream developers in 2020. Thus Debian developers are actively removing Python 2 support in Debian Testing with the goal of getting rid of Python 2 in Debian 11 (bullseye). This is starting to affect Kali Linux and RTLSDR-Scanner as a package in Kali (right now, python-visvis was broken by the removal from Debian of python-imageio). I expect more problems to show up in the future. I note that "visvis" is already ported to Python 3 so this shouldn't be an issue for you.

This is also tracked on the Kali side here: https://gitlab.com/kalilinux/packages/rtlsdr-scanner/issues/1

@EarToEarOak What are your plans for Python 3 support ?

@Evidlo I think you can submit your merge request again the master branch, no? Even if it doesn't get merged immediately, at least your code is available for others...

[rhertzog]

Ah I see you already submitted the merge request here: #51

[yarda]

I introduced #51 into Fedora downstream (Rawhide / f32) otherwise they would drop rtlsdr-scanner package from Fedora, because Fedora is dropping Python 2.