Scanning to the end of the string for every "&" made the entity
resolution quadratic. Stopping at the next "&" also fixes a bare
ampersand swallowing the reference which follows it.
`String.fromCodePoint` throws on anything which isn't a code point,
so e.g. "&#xZZ;" or "�" aborted the whole parsing. Such a
reference is now kept as-is, like an unknown named entity.
With the previous patch this functionality is now *only* accessed on the worker-thread, hence it's no longer necessary to include it in the *built* `pdf.js` file.
* Move display/xml_parser.js in shared to use it in worker
* Save form data in XFA datasets when pdf is a mix of acroforms and xfa
Co-authored-by: Brendan Dahl <brendan.dahl@gmail.com>
