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Latest Xcode (10.2) drops Swift 3 support, so this needed doing.
It also drops the static Swift libs in favor of dynamic; on current macOS (10.14.4), those libs are found at /usr/lib/swift, so this PR uses that, but I'm not sure if that's true on older versions; we might have to add something to ship them in redistributable builds somehow.
Also fixes some deprecation warnings in Obj-C code, and silences all OpenGL deprecation warnings, since they're pretty noisy.