`TTSAFieldPropDef`
pt		InitFromField
pt		InitFromDDFieldDef
pt		SetFieldType
		Create
		FieldIsNullGetterName
		FieldIsNullSetterName
		FieldIsNullPropertyName

`TFieldPropDef`
pt		InitFromField
pt		InitFromDDFieldDef
pt		SetFieldType
pt		SetPropName
		Create
		Assign
		FieldPropDefs
		HasGetter
		HasSetter
		ObjPasTypeDef
		ObjPasReadDef
		ObjPasWriteDef