document the changes that occured since a few months
also display subitems in the changelog

and display the UUID in the about box.
move some stuff out of the overcrowded session menu
disable exporting to the cloud for now
save the user data before closing the PLM on user switch

That PLM shutdown is just not acceptable. We are not on Windows, are we?
try to allow user switching without restarting the PLM (almost working)
preselect the currently used user when switching