java: support compilation by both 8 and 11

[rusefi]

My personal preference is to compile using java 8
the only change needed to compile by JDK 11 is

            <!-- uncomment if you want to compile under java 11
            please remove the space between '-' and '-add-exports' it should be double-dash
                        <compilerarg line="- -add-exports java.xml/com.sun.org.apache.xerces.internal.parsers=ALL-UNNAMED"/>
                        <compilerarg line="- -add-exports java.xml/com.sun.org.apache.xml.internal.serialize=ALL-UNNAMED"/>
                        -->

technically it's possible to adjust build.xml to detect what JDK version is used and add those compilerarg conditionally

[rusefillc]

@dron0gus says https://stackoverflow.com/questions/52502189/java-11-package-javax-xml-bind-does-not-exist

could be as easy as adding jaxb into classpath but depends on gradle migration which was a bit postponed

[rusefillc]

a proper healthy solution here would be to finish gradle migration (a lot was done already) and then make gradle conditional

see #3014

[rusefillc]

https://newrelic.com/resources/report/2022-state-of-java-ecosystem

says 50/50