Adding support in Builder for path animations

Adding support in Builder for path animations

Added a new section called "paths" where paths are specified

  "paths":
  {
    "path0":
    {
      "points":[ [100,100,0],[200,0,0],[300,100,0] ],
      "curvature": 0.25
    }
  }

To create an animation:

  "anim0":
  {
    "duration":1.0,
    "properties":
    [
      {
        "actor":myActor,
        "path":"path0",
        "forward":[1,0,0]
      }
    ]
  }

Change-Id: I11ac1804fe4e005107f42e8d8767cb692fce2d4a