Swift Package manager support for FBSimulatorControl

[AvdLee]

I'm interested into integrating FBSimulatorControl, but I'm heavily using SPM. It would be awesome to convert the library into SPM supported, making it easier to integrate. At the same time, it might allow you to start migrating to a Swift version of this SDK.

I was wondering if you've thought about this before and which challenges you see. I did a quick try to add a Package.swift while keeping files in place, but the file structure and way of importing headers seems to be challenging SPM to link everything together.

Thoughts?