MarkdownUI 0.4.0

• CommonMark parsing moved to gonzalezreal/SwiftCommonMark

• SwiftCommonMark adds an embedded DSL to create CommonMark documents. This allows a new syntax when constructing Markdown views:

  Markdown {
      Heading(level: 2) {
          "Result builders are cool!"
      }
      "Sometimes you want bullet points:"
      List {
          "Start a line with a star"
          "Profit!"
      }
      "Sometimes you want numbered lists:"
      List(start: 1) {
          "One"
          "Two"
          "Three"
      }
  }