Change Summary

Don't be alarmed by the large number of lines changed in this PR. It is pretty much all whitespace-only changes.

• Added an initial swift format rule definition file, and apply the formatting changes. The main thing changing here is to use 4 spaces for tabs instead of 2.
• Added script that runs built in swift formatting and linting.

Tip for reviewing

Make sure to hide whitespace changes before reviewing this. It will drastically reduce the number of lines you have to look at.