Revert "Added constructor to handle raw XML/text inclusion"

We don't use this anymore, since heist now uses a Builder.

This reverts commit df1a89c29f279ef515612e4b99cc98ffe01faff6.
Revert "Don't render xml-decl in trimmed XML renderer."

This reverts commit e599a75702aca62565b1513bd01767a250a5e90f.

Conflicts:
	xmlhtml.cabal
Revert "Expose two (xml+html) new render functions that trim heading and trailing whitespace."

We don't use these functions anymore.

This reverts commit 4d2eaf8333be6e790daf401ec7334c1094797dfa.

Conflicts:
	xmlhtml.cabal
Expose Text.XmlHtml.HTML.Meta.

This exposes voidTags, which is needed to fix a bug in heist.