fast-xml-parser/nexttodo.md

Validate XML or Parse XML to JS/JSON very fast without C/C++ based libraries

* Replace dependecy `he`, as it is increasing browser bundle size from 17kb to 110kb
* build properties only once
* check test coverage and write necessary tests
* validate XML stream data
* Parse JSON string to XML. Currently it transforms JSON object to XML
* Parse XML to nimn data format
* Find alternative of open collective, instead of removing it completely
* XML to JSON ML : https://en.wikipedia.org/wiki/JsonML