Add a Swift Package Manager package #3308
Merged
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This is required for Cocoa to support SPM, as it only supports purely building from source with only SPM-based dependencies.
SPM doesn't have any concept of a "configure" step, so I pushed the part of version.hpp that cmake modifies into a separate header that isn't included when building with SPM and instead hardcoded the version number in package.swift. It can't simply read the version from dependencies.list because the package is evaluated in a sandbox with no access to any other files in the repository. The release script takes care of updating this additional copy of the version, so this shouldn't be a problem.