a mime type and a flag argument. Also fix the following bugs:
9746: get rid of bogus empty <style> in head.
8143: save wrap column in editor shell in case it's set before the
editor is created.
9470, 9488: allow explicit specification of formatted output.
This checkin adds the implementations for encoding
HTML and plain text:
nsTextEncoder::EncodeToString(..)
nsHTMLEncoder::EncodeToStream(..)
Hooked these services into the nsHTMLEditor implemenation
We probably want to update the clipboard code to
use the same pattern as in nsHTMLEditor.cpp
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