File structure refactoring draft

[erikbosch]

This PR shows a possible restructure of VSS files. Note - only signals previously part of the Vehicle folder has currently been refactored, old "large" folders like Body/Cabin/Powertrain has not been touched

This is the files refactored. The idea is to make it easy to find signals, like:

• If you want to find Vehicle.CurrentLocation.GNSSReceiver.MountingPosition.X then you shall look in ./spec/Vehicle/CurrentLocation/GNSSReceiver/MountingPosition.vspec
• If you want to find Vehicle.Speedyou should look in ./spec/Vehicle.vspec

Vehicle.vspec
Vehicle
  Acceleration.vspec
  AngularVelocity.vspec
  Connectivity.vspec
  CurrentLocation.vspec
  CurrentLocation
    GNSSReceiver.vspec
    GNSSReceiver
      MountingPosition.vspec
  Exterior.vspec
  LowVoltageBattery.vspec
  Service.vspec
  Trailer.vspec
  VehicleIdentification.vspec
  VersionVSS.vspec

Every vspec XXX.vspec file represents a branch and has the general structure:

XXX:
  type: branch

# Include sub-branches this way
#include XXX/SubBranch.vspec XXX
  
XXX.SomeSignal:
  datatype: boolean
  type: sensor
  description: .....