MIR-1567 Migrate mycoreobject-modsmeta to Saxon

[toKrause]

Link to jira.

Requires MyCoRe-Org/mycore#2891.

[toKrause]

Lots of tedious groundwork done.

But some things still need to be done:

• modsdetails-external.xsl L 55: mcrxml:compare(string($embargo),dt:date-time()) > 0
• mods.xsl L 313, 413: mcrurn:hasURNDefined($deriv)
• most entries of the action menu cause errors (due to referenced stylesheets that still need to be migrated)
• some TOC stylesheets still need to be migrated
• 'Delete this document' & 'Delete this data object' action: modal has UI issues (X at wrong position) & no function (possible incomplete Bootstrap migration)
• some Xalan-Extensions were replace with callJava-URIs, may need additional specialized XSLT-functions / URI-Resolvers
• transformer causes lots of warnings, like:
  • Exception while XSL transformation:Stylesheet module resource:xslt/mir-utils.xsl is included or imported more than once
  • Exception while XSL transformation:Ambiguous rule match for /mycoreobject/metadata[1]/def.modsContainer[1]/modsContainer[1]/mods:mods[1]/mods:accessCondition[1]
• metadata/mir-video.js.xsl needs to be migrated and is currently commented out in the mycore.properties