Pitch: an Official Style Guide and Formatter for Swift

[akyrtzi (Argyrios Kyrtzidis)]

@freak4pc

I remember a post by one of the SwiftLint team that tried to use SwiftSyntax to hopefully get rid of the SourceKitten dependency and was disappointed by how slow and non-performing it was.

To clarify, this was trying out swift-4.2-branch version which only supported invoking swiftc for parsing. There's a faster way in swift-5.0-branch by calling into sourcekitd, and swift-5.1-branch is even much faster due to changes I first outlined here.