Clone node experiment (#772)

* Specialize TagElement for creating HTMLElements in different ways

* Clone elements for Div, Span and A

* Clone counterparts for Button and Input

* Remove redundant type cast

* Created nodes does not have content so I'm not sure we need to pass true

* H1, H2, H3, H4, H5, H6, P

* Switch all element creation to cloneNode

* Split ElementBuilder and ElementBuilderImplementation

* BROKEN pass ElementBuilder

* Remove obsolete tagName syntax completely

* Fix typo in generic name

* Reintroduce legaci API call signature which uses cloneNode as well