Feature: More configurable results

[halvves]

Allow users to drill down to any part of the Giphy API for the item copied to clipboard.

@puyt what do you think of this implementation? In your zazurc config you would now set

{
  "name": "halvves/zazu-giphy"
  "variables": {
    "src_main": "images.original.url"
  }
}

...to get the same result you had before.

Just now people can set the returned result to anything they want within the giphy api.

[puyt]

@halvves this would indeed be a better and more dynamic solution 👍