@Override
    public List<String> getUserIncludeDirs() {
        return Collections.unmodifiableList(userIncludeDirs);
    }
New package from given path on local file system. Retrieves config definition files from
the default location '$VESPA_HOME/share/vespa/configdefinitions'.

@param appDir application package directory
@param preprocessedDir preprocessed application package output directory
@param metaData metadata for this application package
@param includeSourceFiles include files from source dirs
config-application-package/src/main/java/com/yahoo/config/model/application/provider/FilesApplicationPackage.java