Pull swapchain handling code into separate library

[MarkY-LunarG]

Pull all of the swapchain handling code into a separate library with the intent of having it be stand-alone for use by other GFXReconstruct utilities.

NOTES:

1. This library is called compatibility because I intend to move some other universal functionality into it eventually alongside of the swapchain functionality currently in there.
2. This is currently still using a C++ interface. Going forward, it might make sense to convert this to a C interface if this library is going to be released in a compiled version for other usage scenarios.