One Quickie

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Turn off Xcode project navigator modifying the filesystem (Xcode->Hacks)

One of the worst misfeatures of Xcode9 is "hey, you moved stuff in the project navigator, I'm a gonna screw with your file system with no way to opt out!" This seems to turn it off for now:

% defaults write com.apple.dt.Xcode IDEDisableStructureEditingCoordinator -bool YES