This library derives it's behaviour from SPM's PIF decoding, but adjusts it to work with Xcode's internal json file format.

This allows us to switch out the Node value without massive changes

One test is failing because the output postprocessor is not moving dependencies - that still needs to be addressed

Check modification time to grab the most recent one.

These have different PIF cache locations in the build cache

This attempts to more accurately define what Gen-IR's idea of a target
is, which is a bit different than the PIF representation. Not every
target is considered buildable, so we also split out the storage of
commands and pass them directly to CompilerCommandRunner.