Convert deprecated cython extension class properties to new syntax part 3

[JoeSchiff]

WyattBlue, I saw a note you made here:
https://github.com/PyAV-Org/PyAV/wiki/TODO-general
"Convert properties to decorator syntax. This will also allow doctest to run on them."

Could you explain what you meant by this? Is doctest incompatible with the old syntax?

[WyattBlue]

WyattBlue, I saw a note you made here:
https://github.com/PyAV-Org/PyAV/wiki/TODO-general

Mike Boers wrote that, actually. I don't think those comments are relevant anymore

[mikeboers]

I don’t read everything that goes on here anymore (duh), but when the notification looks like that I can’t refuse, lol