[macOS] Allow opening files from Finder, dock icon menu and more #9411
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Resolves: #8236
Before, in MU4 it was only possible to open files from within the app (for example, from the home tab, or the open recent menu).
Now, the app also reacts to File Open events from macOS, so now you can open files from Finder, from the context menu of MuseScore's Dock icon (which makes the work done in PR #8299 a lot more useful), and more (just like in MU3).
(If you have MU3 installed too, macOS will likely prefer using MU3, so you would have to choose "Open with > MU4".)
On Windows, it already works (sort of) due to the multi-instances system.
I also performed a very small cleanup in some CMakeLists.txt files.