update typescript defs for drop/eventReceive
update typescript defs for drop/eventReceive

fullcalendar/fullcalendar,oleg-babintsev/fullcalendar,arshaw/fullcalendar,arshaw/fullcalendar,arshaw/fullcalendar,oleg-babintsev/fullcalendar,oleg-babintsev/fullcalendar,arshaw/fullcalendar,fullcalendar/fullcalendar,fullcalendar/fullcalendar,fullcalendar/fullcalendar