Bluemo

I've managed to convert CGMutablePath to Data (and base64). ```swift // encoding let cgMutablePath = line.path let uiBazierPath = UIBezierPath(cgPath: cgMutablePath) let data = try? NSKeyedArchiver.archivedData(withRootObject: uiBaizerPath, requiringSecureCoding: false) let...

It took about 0.01s for encoding, 0.005s for decoding + presenting the drawing below. (156 strokes) https://user-images.githubusercontent.com/31824270/90310914-efa1bd00-df30-11ea-9d46-4acd290204e7.jpeg

Could you check my PR?