add Varian 3D models

[ferdymercury]

JSON files are missing

[ferdymercury]

One json file example, ...

{
  "TreatmentMachineName": "Varian TrueBeam",
  "Author": "Fernando Hueso-González",
  "Date":"2023",
  "$schema": "https://raw.githubusercontent.com/???/???-schema.json#",
  "Part": [
    {
      "Type": "Collimator",
      "Name": "Collimator",
      "FilePath": "Collimator.stl",
      "FileToRASTransformMatrix": [ [1, 0, 0, 0], [0, 0, -1, 0], [0, -1, 0, 0], [0, 0, 0, 1] ],
      "Color": [179, 179, 244],
      "State": "Disabled"
    },
    {
      "Type": "Gantry",
      "Name": "Gantry",
      "FilePath": "Varian IX Trilogy/RotatingHeads.stl",
      "FileToRASTransformMatrix": [ [1, 0, 0, 0], [0, 0, -1, 0], [0, -1, 0, 0], [0, 0, 0, 1] ],
      "Color": [244, 244, 244],
      "State": "Active"
    },
    {
      "Type": "Body",
      "Name": "Linac body",
      "FilePath": "LinacBody.stl",
      "FileToRASTransformMatrix": [ [1, 0, 0, 0], [0, 0, -1, 0], [0, -1, 0, 0], [0, 0, 0, 1] ],
      "Color": [230, 230, 230],
      "State": "Disabled"
    },
    {
      "Type": "PatientSupport",
      "Name": "Patient support",
      "FilePath": "Hexapod Evo_confidential/CouchBase.stl",
      "FileToRASTransformMatrix": [ [1, 0, 0, 0], [0, 0, -1, 0], [0, -1, 0, 0], [0, 0, 0, 1] ],
      "Color": [217, 217, 217],
      "State": "Active"
    },
    {
      "Type": "TableTop",
      "Name": "Table top",
      "FilePath": "Hexapod Evo_confidential/Hexapod.stl",
      "FileToRASTransformMatrix": [ [1, 0, 0, 0], [0, 0, -1, 0], [0, -1, 0, 0], [0, 0, 0, 1] ],
      "Color": [0, 0, 0],
      "State": "Active"
    }
  ]
}

[ferdymercury]

There are conflicting 3D truebeam models in SlicerRt and here, we should compare them and stick with the most convenient one