- Add Element#replaceChildren() (Lauri Rooden)

Fixes:

 - Fix commentNode textContent (Lauri Rooden)
 - Fix hasAttribute with `style=""` (Lauri Rooden)
 - Handle rawTextElements with CDATA and html comments (Lauri Rooden)
 - Accept newline in attribute value (Lauri Rooden)

Enhancements:

 - Unify variable names (Lauri Rooden)
 - Use simple loop in StyleMap (Lauri Rooden)