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As before, a minor refactor: * I started off by removing the Monarch/Peasant with the goal of moving it into and deduplicating its functionality with `WindowEmperor`. * Since I needed a replacement for the Monarch (= ensures that there's a single instance), I wrote single-instance code with a NT mutex and by yeeting data across processes with `WM_COPYDATA`. * This resulted in severe threading issues, because it now started up way faster. The more I tried to solve them the deeper I had to dig, because you can't just put a mutex around `CascadiaSettings`. I then tried to seeif WinUI can run multiple windows on a single thread and, as it turns out, it can. So, I removed the multi- from the window threading. * At this point I had dig about 1 mile deep and brought no ladder. So, to finish it up, I had to clean up the entire eventing system around `WindowEmperor`, cleaned up all the coroutines, and cleaned up all the callbacks. Closes #16183 Closes #16221 Closes #16487 Closes #16532 Closes #16733 Closes #16755 Closes #17015 Closes #17360 Closes #17420 Closes #17457 Closes #17799 Closes #17976 Closes #18057 Closes #18084 Closes #18169 Closes #18176 Closes #18191 ## Validation Steps Performed * It does not crash ✅ * New/close tab ✅ * New/close window ✅ * Move tabs between windows ✅ * Split tab into new window ✅ * Persist windows on exit / restore startup ✅