mlr3 0.11.0

• Added a as.data.table.Resampling method.
• Renamed column "row_id" to "row_ids" in the as.data.table() methods
  for PredictionClassif and PredictionRegr (#547).
• Added converters as_prediction_classif() and as_prediction_regr() to
  reverse the operation of as.data.table.PredictionClassif() and
  as.data.table.PredictionRegr().
• Specifying a weight column during learner$predict_newdata() is not mandatory
  anymore (#563).
• Task$data() defaults to return only active rows and columns, instead of
  asserting to only return rows and columns. As a result, the $data() method
  can now also be used to query inactive rows and cols from the DataBackend.
• New (experimental) column role uri which is intended to point to external
  resources, e.g. images on the file system.
• New helper set_threads() to control the number of threads during calls to
  external packages. All objects will be migrated to have threading disabled in
  their defaults to avoid conflicting parallelization techniques (#605).
• New option mlr3.debug: avoid calls to future in resample() and
  benchmark() to improve the readability of tracebacks.
• New experimental option mlr3.allow_utf8_names: allow non-ascii characters in
  column names in tasks.