Handle parsing issues in METs packages

[cristianvasquez]

Some METs packages have been reported to fail parsing due to issues with their contents. The causes identified are:

1. Character encoding issues

 org.xml.sax.SAXParseException; lineNumber: 24; columnNumber: 48; The entity name must immediately follow the '&' in the entity reference.

2. It is not allowed to have HTML markup in the title text

[cristianvasquez]

Apparently this is to escape the contents in the XML jinja template through operators:

https://tedboy.github.io/jinja2/templ10.html

For instance,

ted-rdf-conversion-pipeline/ted_sws/notice_packager/resources/templates/mets_xml_dmd_rdf.jinja2

Line 24 in 01673c0

<cdm:work_title xml:lang="{{ lang }}">{{ work.title[lang] }}</cdm:work_title>

becomes

        <cdm:work_title xml:lang="{{ lang }}">{{ work.title[lang]| e }}</cdm:work_title>