adapt the yml structure to manage parallel branches

[alexandrecuer]

maybe introduce a parallel key ?

[alexandrecuer]

yaml can be something like :

  branches:
    plant: 
      - [Pump]
      - parallel:
        - [PAC]
        - [Boiler]

graph LR
   Pump --> PAC
   Pump --> Boiler
   PAC --> Pipe
   Boiler --> Pipe

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  branches:
    plant: [Pump, PAC, Boiler]

graph LR
   Pump --> PAC
   PAC --> Boiler

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