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* Add a "ReplaySpecializer" to fix certain replays Due to the fact that a given entity in either database type can map to multiple entities in the other database, there are certain replication scenarios that don't quite work. Current known examples include: - propagation of cascading deletes from datastore to SQL - creation of datastore indexed entities for SQL entities (where indexes are a first-class concept) This change introduces a ReplaySpecializer class, which allows us to declare static method hooks at the entity class level that define any special operations that need to be performed before or after replaying a mutation for any given entity type. Currently, "before SQL delete" is the only supported hook. A change to DomainContent demonstrating how this facility can be used to fix problems in cascading delete propagation will be sent as a subsequent PR. * Throw exception on beforeSqlDelete failures * Changes for review