calibmsm 1.1.3

Fix tests identified as failing from reverse dependency checks due to upcoming changes in the new release of ggplot2, which is now transitioning to S7 class (see here)

calibmsm 1.1.2

Change of code format to snake_case for all function arguments.
Updating of overview vignette, and sensitivity-analyses-for-IPCWs, to bring inline with published manuscript.

Minor update introducing a new S3 generic metadata, and updated some S3 methods which were producing errors.

Change to package structure.
Introduced one master function calibmsm which assess calibration using BLR-IPCW, MLR-IPCW and pseudo-values methodology.
calib_blr changed to calib_blr_ipcw, calib_mlr changed to calib_mlr_ipcw, and calib_blr_ipcw, calib_mlr_ipcw and calib_pv are all changed into internal functions.
Return the pseudo-values used to estimate calibration curves in the output for calib_pv, this allows users to parallelise code when estimating pseudo-values.
Some minor changes to code of internal functions, and introduction of some new internal functions for processes which occur a number of times within the package (for example application of landmarking).