v3.9.0

• Core
  • Added Id.IsTemporary, Id.AddEmptyValue, Id.RemoveEmptyValue; Changed IsUnset to IsEmpty.
• Data.Client
  • Made the BinaryExpressionConverterBase try to match the types of the arguments.
  • Added a base for client query executors.
• Data.Model
  • Extended the entity part to classes and interfaces too.
• Data
  • Added the Ref class.
  • Added FindOneCommand to replace the existing extension method.
  • Fixed the DataContextQuery, made orderable.
  • Added the RequiredRef attribute.
  • DataContextQueryProvider attaches the entities upon execution.
  • DataContextCache in GetEntityInfo sets the entity info to the entity if not already set.
  • Made the Async methods in DataBehaviorBase typed.
• Added Kephas.Data.Endpoints for client-server communication.