Change `FromXmlParser` to reduce mutability#756

cowtowncoder merged 2 commits into3.xFasterXML/jackson-dataformat-xml:3.xfrom

tatu/3.0/make-xml-text-name-cfg-finalFasterXML/jackson-dataformat-xml:tatu/3.0/make-xml-text-name-cfg-finalCopy head branch name to clipboard