remove part when empty selected (#103)
make title_formatter accept a list of objects (#103)
adapt title composer output to formater input (#103)
initialize separator with null (#103)
title_formatter uses meta_data labels (#103)
append labels to model.labels if needed (#103)
fix separators (#103)
add TitlePart.format (#103)
title formatter uses part.format (#103)
add xAxisTitle and yAxisTitle to editor (#103)
update titles in charts (#103)