extract relevant information from renderers when creating the scene.
extract relevant information from renderers when creating the scene.

@jbernal0019 maybe if would make sense to move what we currently have in the scene object
into a 'general' object inside it.
Similarly, we would have a 'renderers' array in the scene object to hold all renderers specific
information.

scene = {
  general: {
    hasThumbnailBar : true,
    renderersLinked: true,
    etc...
  },
  renderers: renderers
}

FNNDSC/viewerjs,FNNDSC/viewerjs