Add XmlNode parent#14

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elementgreen wants to merge 2 commits intoopticron:masterfrom

elementgreen:xml-node-parent

Commits on Jan 19, 2025

Add XmlNode cloning: XmlNode.cloneNode, UCData.cloneUCData, CData.cloneCData,
elementgreen
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Add XmlNode.getParent() and enforces that an XmlNode can only be added to one parent (breaks backwards compatibility)
elementgreen
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