Updated all tools & libraries to latest versions. Cleanup. Resource leak fixes. #88
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Updated GitHub Actions to Java 21.
Updated all libraries.
Updated Gradle to 8.11.1.
Fixed some potential resource leaks.
Fixed deprecation warning.
Updated Maven pom.xml also to latest versions of libraries etc. Ensured that newline characters used in XML Schema creation are the same on all operating systems (always \n now). Added missing documentation.
Fixed some resource leaks.
Moved some useful functions from Test classes to Utility. All enumerations are now in capital letters in Java (the XML pendants are still camel case). Lot's of cleanup.