use loguru for logging
Simplify logging by externalizing the creation of loggers from the libraries to the run scripts.
This is used and implemented in nsx
by https://git.lwp.rug.nl/chimera/nsx/-/merge_requests/114 (see description!!)
TODO before merging: ROUKF, hyperelastix, fsix DONE
Edited by D.J. Nolte