Linux: adjust launch script to allow overriding CLASSPATH
Graph: raw implementation of getEventMessages and searchEventMessages
Graph: cleanup message headers parsing
Graph: implement davmail.folderSizeLimit on message folders
Graph: adjust isItemId for immutableId values
Graph: optimize folder requests by returning only id to build FolderIds
Graph: force ImmutableId as a workaround for ErrorIrresolvableConflict error
Graph: fix non draft message creation, by default not read