v2.1.0

Changed

• [BREAKING] The logic to verify valid filter combinations has been moved to the DataSource interface.
  This improves the ability to customize the data source and allows for more complex filters.
  This change will only affect you if you have implemented a custom data source. You will need to
  add a isFilterCombinationValid method to your data source.
• You can now use nested spreadChildren in map properties, allowing to show arbitrary
  nested structures as single columns in the collection view.
• The collection count value is now updated with filters applied.
• Fix for csv export not working when underlying data is invalid.
• Fix for bug of collection search returning a single result.
• Fix for reference fields breaking with incorrect values.