Release 3.2.4

[tovbinm]

• OpVectorColumnMetadata.hasParentOfType should be using exists
• Made Splitter methods public and not final so can extend classes
• Date time map now has reference date
• Make TestFeatureBuilder correctly generate originStage
• Allow specifying cutOff logic for conditional readers
• Moved stage fit into trait that can be reused in CV and TS
• Use array when applying op transformers
• Change minInfoGain Param default in DecisionTreeBucketizer
• Aggregator fixes
• Fixed max modeling default
• Call stage.setInputSchema before transformSchema is called
• Delete the cli test dir recursively
• Refactored op read/write stage tests
• Bumped the minimum sample size up to 1000 for SanityChecker
• Added internal ValidatedModel type for to hold intermediate in ModelSelector
• Flattened cross validation classes so can make workflow level CV
• Upgrade to gradle 4.5.1 + fix date time utils tz
• Added persist in sanity checker after sample
• Fixed catalyst issue when training very wide datasets
• Added MaxRealNN, MinRealNN, MeanRealNN + cleanup some aggregator tests
• CLI fixes
• Allow disable version props generation
• Add Scalastyle check for license header
• Strip HTML tags for text features