AXIS2-6105 Remove JiBX, SOAPMonitor, and Scripting modules

JiBX: Dead project (last release 2016, last Axis2 commit 2009 by
Dennis Sosnoski). ADB and JAXB are the active data bindings.

SOAPMonitor: Java Applet-based SOAP message viewer. Applets were
removed from the JDK in Java 11 (2018). Non-functional on any
supported JDK. Originally added as AXIS2-434 in April 2006.

Scripting: BSF/JSR-223 scripting support. Nashorn (the default
script engine) was removed from the JDK in Java 15. No modern
users — anyone wanting server-side JavaScript uses Node.js, not
an embedded script engine in a web services framework.

Removes modules, dependencies, properties, legal files, samples
(quickstartjibx), codegen JiBX extension, site documentation,
and all cross-references in POMs, assembly descriptors, toc.xml,
contents.xml.vm, and modules/index.xml.