styles attribute should use typed attributes name instead of js.Dictionary

[simerplaha]

Currently all styles get added to js.Dictionary. But the newer versions have typed properties

This HTML

<ul style="list-style: none; padding: 0;">

currently generates this

<.ul(^.style := js.Dictionary("list-style" -> "none", "padding" -> "0"))

But now we should generate this for Scalajs-react's VDOM

<.ul(^.listStyle := "none", ^.padding := "0")

and this for Scalatags

ul(listStyle := "none", padding := "0")