mlr 2.18.0

• Many praznik filters are now also able to deal with regression tasks (#2790, @bommert)
• praznik_MRMR: Remove handling of survival tasks (#2790, @bommert)
• xgboost: update objective default from reg:linear (deprecated) to reg:squarederror
• issue a warning if blocking was set in the Task but blocking.cv was not set within `makeResampleDesc() (#2788)
• Fix order of learners in generateLearningCurveData() (#2768)
• getFeatureImportance(): Account for feature importance weight of linear xgboost models
• Fix learner note for learner glmnet (the default of param s did not match the learner note) (#2747)
• Remove dependency {hrbrthemes} used in createSpatialResamplingPlots(). The package caused issues on R-devel. In addition users should set custom themes by themselves.
• Explicitly return value in getNestedTuneResultsOptPathDf() (#2754)