as all code using IO handlers has been changed to use secop.rwhandler, IO handlers can be removed Change-Id: Id57fbc4ce2744dbe73bb8792fd45449373f76bb5 Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/28526 Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>