v4.0.0-alpha3

Breaking changes:

#520: Patch requests where the payload does not include the id(s) of the target resource(s) is no longer accepted.
#519: UpdateAsync(TId id, TEnity entity) was replaced with UpdateAsync(TEnity entity)
#478: RelationshipAttribute.Type was replaced with RelationshipAttribute.DependentType
#478: EntityResourceService constructor EntityResourceService(IJsonApiContext, IEntityRepository<TEntity, TId>, ILoggerFactory, loggerFactory, IResourceMapper ) was deprecated and replaced with EntityResourceService(IJsonApiContext, IEntityRepository<TEntity, TId>, IResourceHookExecutor = null, IResourceMapper mapper = null, ILoggerFactory = null)

Bug fixes / clean up

#522 An issue with deserializing timespans was fixed. Thanks to @ngboardway!
#518: The DefaultEntityRepository has had a major cleanup. Thanks to @wisepotato for reviewing!

• problems errors of with entities being attached to the DbContext with the usage of hooks and custom services has been fixed
• changes done to entity in a custom service before calling the old UpdateAsync(TId id, TEnity entity) repository method were not actually saved to the database.
• Progress was made to decouple IJsonApiContext (see #512) from the repository layer by removing usage of HasOnePointers and HasManyPointers.

New features

#502 support for "implicit removal" of relationships
#478 Resource Hooks, see the usage guide for detailed description. Thanks @wisepotato, @milosloub and @jaredcnance for extensive reviewing!