mice 3.16.0

Major changes

• Expands futuremice() functionality by allowing for external packages and user-written functions (#550). Contributed @thomvolker

• Adds GH issue templates bug_report, feature_request and help_wanted (#560). Contributed @hanneoberman

Minor changes

• Removes documentation files for rbind.mids() and cbind.mids() to conform to CRAN policy
• Adds mitml and glmnet to imports so that test code conforms to _R_CHECK_DEPENDS_ONLY=true flag in R CMD check
• Initializes random number generator in futuremice() if there is no .Random.seed yet.
• Updates GitHub actions for package checking and site building
• Preserves user settings in predictorMatrix for case F by adding a predictorMatrix argument to make.predictorMatrix()
• Polishes mice.impute.mpmm() example code

Bug fixes

• Adds proper support for factors to mice.impute.2lonly.pmm() (#555)
• Solves function naming problems for S3 generic functions tidy(), update(), format() and sum()
• Out-comments and weeds example&test code to silence R CMD check with _R_CHECK_DEPENDS_ONLY=true
• Fixes small bug in futuremice() that throws an error when the number of cores is not specified, but the number of available cores is greater than the number of imputations.
• Solves a bug in mice.impute.mpmm() that changed the column order of the data