[Foxet] Support for &entities (and undescore)

[Hans Hagen]

Adam Lindsay wrote:

> For decimal number character entities, I've been advising the following
> patch (added to cont-new.tex, for example):
> \def\executeXMLdeccharacter#1\relax % 
>   {\utfunifontglyph{#1}}
> 
> I couldn't quite get it right for the hexadecimal entities (“),
> however.
> 
> So *some* entities work. I suggest doing a reduction and finding out
> which ones don't (with your usage pattern) and why.

so we need someone to make us a test file ...

Hans

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