What's Changed
* More small fixes by andlaus in https://github.com/mercedes-benz/odxtools/pull/322
* Implement diagnostic variables by andlaus in https://github.com/mercedes-benz/odxtools/pull/323
* Diag layer refactoring spinoffs by andlaus in https://github.com/mercedes-benz/odxtools/pull/327
* tablekeyparameter: fix short name reference resolution by andlaus in https://github.com/mercedes-benz/odxtools/pull/325
* SDGs: if the SDG caption is referenced, do not add its IDs to the odxlink database by andlaus in https://github.com/mercedes-benz/odxtools/pull/328
* EnvironmentDataDescription: do not add links to referenced environment data objects by andlaus in https://github.com/mercedes-benz/odxtools/pull/329
**Full Changelog**: https://github.com/mercedes-benz/odxtools/compare/7.3.0...7.4.0