Fix Xcode 13.4 build error & modernize project #174
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It complains about a linking cycle when having a public header in Xcode 13.4
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It seems there is a change in Xcode 13.4 compiler, in which the old "public header" (which in fact useless) causes a ref cycle when linking. It stopped the original version from compiling.
This PR fixes the issue by removing the unnecessary header file copying. It also updates the project to the latest, as well as fixes some warnings generated in the new Xcode version.