Xerces hell part 2 (equation preview)

[PHPirates]

Fix #3274

Summary of additions and changes

See https://stackoverflow.com/questions/11677572/dealing-with-xerces-hell-in-java-maven

• managed to reproduce the exception, added a dependency on batik-svg-dom (note: the one from xmlgraphics does not work)
• Exclude xml-apis and xerces from all dependencies to avoid exceptions like https://stackoverflow.com/questions/2661326/java-lang-nosuchmethoderror-org-w3c-dom-document-setdocumenturi