NSAppearance Change Notifications for Dark Mode and RxSwift Subscriptions

Last year, I had a full-time job from May until November and haven't had much time to prepare for Mojave. Then it hit hard, and I am still tweaking my apps to look properly in Mojave's Dark Mode. I welcome that macOS offers two modes now, .aqua and .darkAqua in programmer parlance. Because then I don't have to implement a homebrew solution in all my writing applications.

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