difuture-lmu/ds.calibration: Calculate calibration of a given model on DataSHIELD servers

Calculate the calibration of a model on DataSHIELD servers. The methods provided are the Brier score and calibration curves. Note that DataSHIELD uses an option `datashield.privacyLevel` to indicate the minimal amount of numbers required to be allowed to share an aggregated value of these numbers. Instead of setting the option, we directly retrieve the privacy level from the `DESCRIPTION` file each time a function calls for it. The privacy level is set to 5 by default.

install.packages("remotes")
remotes::install_github("difuture-lmu/ds.calibration")