Bring the core openAPI.yaml up to date with the code

[Castavo]

Many schemas fell behind, among others:

• RollingStock
• TrainSchedule
• SimulationRequest

[codecov[bot]]

Codecov Report

Merging #1504 (78a494f) into dev (3c762d4) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev    #1504   +/-   ##
=========================================
  Coverage     71.81%   71.81%           
  Complexity     1507     1507           
=========================================
  Files           235      235           
  Lines          7320     7320           
  Branches        878      878           
=========================================
  Hits           5257     5257           
  Misses         1687     1687           
  Partials        376      376           

Flag	Coverage Δ
core	79.78% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[multun]

@Castavo this PR never left the draft stage, do you want to ditch or resurrect it?

[Castavo]

@multun I don't think I can finish it myself, there are so many items out of date and that I don' know of. I guess it would be better to scrap it.

[multun]

Fine, here it goes :skull: