Simulation of the new final state for given entry time, inital
state, all cause baseline hazard rates, transition specific covariate
effect functions and transition specific values of the linear predictor.
transition specific values of the linear predictor.
x.i
vector of covariate values if indivdual i.
diagnostics
logical triggering whether diagnostics about errors (most likeliy because uniroot does not find a root) should be printed during the simulation process?