Avoid duplicate codes because of recodes about statcuber

[GregorDeCillia]

Multiple codes and labels are now concatinated using a semicolon. In the above example, the first classification (useful energy category) of is now parsed as follows

• label: Space and water heating;Process heat <200 °C
• code: VERWEND0-1;VERWEND0-2

sc_table('test.json')$field("C-VERWEND0-0")
#> # STATcubeR metadata: 3 x 7
#>   code                  label                                        parsed                                      
#>   <chr>                 <chr>                                        <chr>                                       
#> 1 VERWEND0-1;VERWEND0-2 Space and water heating;Process heat <200 °C Space and water heating;Process heat <200 °C
#> 2 VERWEND0-1            Space and water heating                      Space and water heating                     
#> 3 SC_TOTAL              Total                                        Total                                       
#> # … with 4 more columns: 'label_de', 'label_en', 'visible', 'order'