Removes the "NetAccess" and "Security" configuration properties from the Office.Java schema. Also removes the corresponding logic in stoc/source/javavm/javavm.cxx that read these properties to configure the JVM appletviewer mode. Since Applet support is being removed (deprecated in Java 9, removed in Java 17), the JVM no longer needs these specific security flags. Change-Id: Ifb2a2be4d103750d918d938d569c7dc8e196f19d Reviewed-on: https://gerrit.libreoffice.org/c/core/+/195591 Reviewed-by: Stephan Bergmann <stephan.bergmann@collabora.com> Tested-by: Jenkins