Improvements

• #5794: Creating a Domain using Domain.fromDict can no longer alter the input dictionary.
  Previously, there could be problems when the input dictionary was re-used for other
  things after creating the Domain from it.

Bugfixes

• #5617: Don't create TensorBoard log files during prediction.
• #5638: Fix: DIET breaks with empty spaCy model
• #5755: Remove clean_up_entities from extractors that extract pre-defined entities.
  Just keep the clean up method for entity extractors that extract custom entities.
• #5792: Fixed issue where the DucklingHTTPExtractor component would
  not work if its url contained a trailing slash.
• #5825: Fix list index out of range error in ensure_consistent_bilou_tagging.

Miscellaneous internal changes

• #5788