[FEATURE] implemented mapping data type

- the mapping data type helps to find to a specific value another value in a mapping object which will be shown for the user
- minor bugfixes

__Tasks:__

- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none
@michaelzangerle remove this condition, since it's the one above does exactly the same ;)