Swift: update visual test after syntax changes

Updates the visual test to the syntax in Xcode 6 beta 4.

Changes:
- New syntax for Unicode escape sequences
- New keywords: private, internal, public
- @final, @lazy, @optional, and @required lost the @

I have also corrected a few typos and made sure the file
compiles without errors in an Xcode playground.

- Chang sort() to sorted()
- import Foundation for the uppercaseString method
Swift: Fix Unicode escape sequence in visual test
Swift: new syntax for Unicode escape sequences
Swift: Add keywords private, internal, public
Swift: Add keywords final, lazy, optional, required
Swift: Add support for attributes

All attributes begin with an @ sign.

assignment, auto_closure, class_protocol, IBAction, IBDesignable, IBInspectable, IBOutlet, noreturn, NSCopying, NSManaged, objc, UIApplicationMain
Swift: Fix Unicode escape sequence matching

Escape curly braces in regex
Swift: β5 attributes and declaration modifiers
Swift: properly highlight private(set) and @objc(…)
Swift: Treat Any and AnyObject as built-in types
Swift: Color type name in class/protocol/extension definitions
Merge pull request #169 from radex/swift-beta5

Swift: Beta 4, 5 changes and highlighting improvements