MacOS 10.15 Catalina

[tattwamasi]

Stub issue for 10.15 support.
Initial tries show the util still works in 10.15. Took a while first run to process the iTunes playlist records, but after that the playlists all show up and the util can still access everything as if iTunes exists (even if it is now smaller and called Music).

Current plan is to continue the oft-delayed process of getting all the dependencies sorted and properly tracked in the repo, make sure it all still works for all modern-ish versions it has worked for, plus 10.15, then roll a release and most likely stop further development along this path.

If there's any support, I have two other things I am tempted to do:

I might try actively engaging with Tesla to find out what's really going on with AAC, and either add support for fixing whatever the AAC Model 3 issue is, or get a better codec workaround than blowing files up to lossless.

I might create a new util with a new, less annoying, more streamlined UI.