U+feff is now used instead of U+200b for nick-dehighlighting.
U+feff is non-breaking; it will not break-up the word when wrapping. It also
appears to be much more widely supported. In fact, some terminals will simply
strip the bytes -- this allows copying the text as-is, etc.
Additionally, an exclude-list was added to prevent dehighlighting of specific
nicknames. This is because several terminals do not fully support Unicode's
zero-width spaces -- they show up as plain spaces. Certain words for the #c
channel have been added to this exclude list since they are also somewhat
popular as nicknames there.
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