Xcode project file changes because of Mac Developer signing chain cleanup.
Rework NukeCtl::Transform and ChanArgMap interface and implementation the better to match Nuke's calling patterns.
Xcode project file component to help track what's in the repo.
Add hooks for NukeCtl::Transform, and a [commented-out] body in the pixel engine.
Add ChanArgMapFriend; rework TransformFriend to store a copy of a Transform so we can call non-static methods on it.