Migrate to JSON

[kaivalyar]

Current data download happens through text files:

(1,2)(3,4)
-------------------
[1,2]
-------------------
(4,2)(7,4)(1,8)(5,0)

Might be more beneficial to have a JSON file instead, with entire information to be captured:

{
  image: "imageX.png",
  points: [
    [(1,2), (3,4)],
    [(1,2)],
    [(4,2), (7,4), (1,8), (5,0)]
  ],
  dblclk: [
    false, true, false
  ]
}