Change data format to property list included tags and archived flag

[0si43]

It's like:

struct Model: Codable {
  var drawing: PKDrawing
  var tags: [String]
  var isArchived: Bool
  var createdDate: Date
}

And I needed TagList.

struct TagList {
  var tags: Set(String). // is this correct?
  var colors: [UIColor] = [.red, .blue. …]
// and something to match tags and colors 
}