GitLab

    added test
    added properties file

    launch configuration for launcher library is created if project
        is not available
    cleanup

ZmtEclipsePlugin.java
    fixed import
    launcher project is accessed only if present
    replaced launcher project names with constant
ZmtEclipsePlugin, ZmtJavadocPlugin.java
    referring to class literals via '.class' to be explicit

        returns 'UNVERSIONED'

build.gradle
    added junit dependencies for tests