Flatten JSON Object Field in DX12 Methods

[andrew-lunarg]

I'd suggest changing this before people write any scripts against the structure we inherited from the DX12 toASCII format. It's obviously slightly arbitrary / a matter of opinion as to which is better.

Current* Format:

{
  "index": 3945,
  "method": {
    "name": "RSSetViewports",
    "thread": 1,
    "object": {
      "type": "ID3D12GraphicsCommandList",
      "handle": 25
    },
    "args": {
      "NumViewports": 1,
      "pViewports": [
        {
          "TopLeftX": 0.0,
          "TopLeftY": 0.0,
          "Width": 1280.0,
          "Height": 720.0,
          "MinDepth": 0.0,
          "MaxDepth": 1.0
        }
      ]
    }
  }
}

Suggested format which saves storage and places the name of the function next to the name of the object type for easier human scanning / grokking:

{
  "index": 3945,
  "method": {
    "handle": 25,
    "type": "ID3D12GraphicsCommandList",
    "name": "RSSetViewports",
    "thread": 1,
    "args": {
      "NumViewports": 1,
      "pViewports": [
        {
          "TopLeftX": 0.0,
          "TopLeftY": 0.0,
          "Width": 1280.0,
          "Height": 720.0,
          "MinDepth": 0.0,
          "MaxDepth": 1.0
        }
      ]
    }
  }
}

* Current when this lands: https://github.com/andrew-lunarg/gfxreconstruct/tree/andy-enhance-better-d3d12-convert