Sourcekitten dependency removal

As we've moved to SwiftSyntax, @tianskylan has removed the dependency on SourceKitten

Statically link SwiftToolsSupport

Statically link SwiftToolsSupport so that dependent packages can distribute easily.

SHA fix

Unfortunately depending on the core swift tools means that we do get breakage sometimes due to the current version being 0.x.

Latest Changes

Move to using the new swift-tools-support-core (#26)

- This new framework has the useful bits pulled out of the SPM project