Add HTML encoding escape and unescape

[denandz]

Add an additional encoder/decoder for HTML escaping:

:~$ echo '<script>alert(1);<script>' | ./pencode htmlescape ; echo
&lt;script&gt;alert(1);&lt;script&gt;
:~$ echo '&lt;script&gt;alert(1);&lt;script&gt;' | ./pencode htmlunescape ; echo
<script>alert(1);<script>

[denandz]

@joohoi any chance of getting this merged in?

[joohoi]

I’ll look into it tomorrow!

…

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[denandz]

Heya @joohoi - Any luck with the merge? Would like to see this functionality in Pencode.

[joohoi]

Sorry for the delays, the PR looks good, thanks again for your contribution (and patience) @denandz