CreateNewImputeMechanism: A function which creates an Impute Mechanism object
In dejaVu: Multiple Imputation for Recurrent Events

A function which creates an Impute Mechanism object

CreateNewImputeMechanism(
  name,
  cols.needed = vector("character"),
  impute,
  parameters = NULL
)

`name`	The method name (used for printing)
`cols.needed`	which columns of the SingleSim data frame are required by the method, typically `c("censored.time","observed.events","arm")`
`impute`	A function which takes a `SingleSimFit` object and outputs the details for a single imputed data set, specifically a list with two elements: `new.censored.times` - a vector of times subjects were censored (after taking into account imputation) and `newevent.times` - a list of vectors where the vectors contain the imputed event times for the subjects (these vectors do not contain the observed event times before subject drop out). If a subject has no imputed events then the vector `numeric(0)` is returned.
`parameters`	A list of named parameters describing the method (used for printing) - or NULL if none