introduced Conceptual::ConceptualModel
added ModuleFragment
added BoundedContext
added Conceptual::DataType
print conceptual data types to plain text, add core data types
added BoundedContextFragment
extended test model creation
added DomainObject
added DomainObjectFragment
added Value
added DedicatedValue
added IdValue
added ObjectVersionValue
added LastModificationTimestampValue
added LastModifiedByUserValue
added ObjectIsDeletedValue
added TupleIsDeletedColumn
introduced SystemValue as base value object for all id/versioning vals
added UserValue
added ObjectDescriptionValue