add stars plugin to ui3 for testing actions
add stars plugin to ui3 for testing actions

lsaffre/lino_book,khchine5/book,lsaffre/lino_book,lino-framework/book,khchine5/book,lino-framework/book,lino-framework/book,lino-framework/book,lsaffre/lino_book,khchine5/book