1.6.4.5 released

Avoid an exception if a moreInfo element has no id reference and no info children
Add a new error message if a moreInfo element has an id reference and has info children
Show an exception if a duplicate index file is found
Allow to specify the index file in the properties file
Fix the xml reader for articles not being able to both escape content and parse html entities
Fix the help wiki generation throwing a NPE if there was a referTo for the index
Don't try to generate the index in the docx or the pdf output format if there is a referTo for the index
Don't try to generate the index in the epub format if there is a referTo for the index
Add a lot of html entities
Improve the tool allowing to generate the areaRef elements under an image
Use jSoup 1.16.1
Use MDIUtilities 1.2.49