Improvement to element creation DSL

This release changes how Elements are configured on creation. Old approach:

button {
   element {
      classes("bigbutton")
      this["autofocus"] = true
      text("Click Me!")
   }
}

New approach:

button { btnEl ->
    with(btnEl) {
        classes("bigbutton")
        this["autofocus"] = true
        text("Click Me!")
    }
}

The element { } block is now deprecated in favor of this approach.

What's Changed

• New approach to configuring elements by @sanity in #366

Full Changelog: 1.0.2.1...1.1.0