JWt

See https://redmine.emweb.be/boards/4/topics/17892

Fix:

  <target name="run">
    <java jar="lib/antlr-4.7.2-complete.jar" fork="true">
      <arg line="-no-listener -visitor -package eu.webtoolkit.jwt -o src/eu/webtoolkit/jwt src/eu/webtoolkit/jwt/PluralExpression.g4" />
    </java>
    <java jar="lib/antlr-4.7.2-complete.jar" fork="true">
      <arg line="-listener -no-visitor -package eu.webtoolkit.jwt.render -o src/eu/webtoolkit/jwt/render src/eu/webtoolkit/jwt/render/Css22.g4" />
    </java>
  </target>