#IK and ID data should have residual informations
#Adding time normalization to individual containers could be nice? Do I need to be careful if they already have time information?
#Events from c3d need to be handled on c3d handler and also added to the fileconverter
#unlabaled trajectories need to be handled
#Subject class is not maintained.
#sampling rate checks / automatic derivation from time should be implemented to all containers.