Catalina on Dell XPS 9500 (year 2020 model) (OpenCore)

I've created a repository on GitHub to share my progress with getting Catalina to run on Dell XPS 9500.
It is almost fully working for me but there may be several other things I haven't tested, including HDMI video/audio output.

Any help on fixing the outstanding issues appreciated - headphones jack and sleep mainly. Sleep is due a Dell BIOS bug, but maybe someone can come up with some ideas to fix it with alternate methods. Dell isn't the most competent when it comes to fixing BIOS bugs...

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