We previously used incremental `file(WRITE ...)` commands that gradually recreated the file on every CMake invocation. This sometimes lead to Xcode parsing a partially written file, which in turn breaks building dependend targets. Instead, we're now using a templated configuration file, which ensure that the file is created in one go and hopefully reduces the race condition between CMake and Xcode's automatic project updating.
The X.Y.Z version portion was unreliable, as it pulled from the latest tag regardless of platform. Set version to 0.0.0 and retrieve only the hash, which allows us to drop the node/npm dependency.
