Upcoming hard fork [view tags / identify outputs]

[plowsof]

Hello, as you may be aware, view tags will be added in the next hard fork (block 2,668,888) and the block data will have a breaking change to the json format for vout data:
pre fork:

{ 
  "target": {
    "key": "ea3f..."
  }
}

post fork:

{ 
  "target": {
    "tagged_key": {
      "key": "ea3f...",
      "view_tag": "a1"
    }
  }
}

@j-berman has offered to help with implementing this in the ecosystem. There is also a ' work in progress ' / 'here's what it might look like' version of it implemented in python in this pull request to an existing python library that identifies outputs. Hope this helps

I believe these changes would need to be placed somewhere here in UniversalIdentifier.cpp