Added support for modifying and creating new XML nodes

🆕 Added ability to change values and create/delete attributes and child nodes.

Further testing with different kinds of XML data is required before being able to confidently mark this as release-worthy, and reaching the quality-mark of calling it a release. For now it should work in most development projects, but situations could occur where it fails to parse. Make sure to always check if the root node is null. As long as this is a pre-release, please stay in the Discord for notifications when the next release is made, as bug fixes are likely. Initial testing during livestream resolved several bugs.

Please read the README.md with markdown-compatible display or on the GitHub website for documentation.