Repurposing html() to be setter/getter and adding rawHtml() for plug-in ...

...development access. Deprecating xhtml() and _html()
I fully agree, but being unfamiliar I made my changes basically on a 1:1 basis.  All things being equal, rawHtml() replaces _html() and html() replaces xhtml().  That was the approach used to update everything, so if it's no correct then let's talk about how it should be changed.