Previously, libMoltenVK.dylib was created by copying and renaming the binary from MoltenVK.framework, but this resulted in an unsigned dylib that was not loadable. - Create signed macOS libMoltenVK.dylib directly from Xcode. - Refactor package_moltenvk.sh into package_dylibs.sh & package_headers.sh. - Remove unused non-packaging Xcode schemes (unrelated).