Create string to context bindings

Link context files with the strings they contain.

The binding tells Smartling to show Translators which context images for which strings.

A basic bindings request should contain an object with a bindings JSON array, with at least one element (binding) featuring contextUid and stringHashcode properties:

{
  "bindings": [
    {
       "contextUid": "25137b65-e075-4341-8362-14b1a3e558f5",
       "stringHashcode": "bd603147d945h3ec74d6874422ebe4e0"
    }
  ]
}

For IMAGE context, each binding may have additional coordinates data that specifies a rectangular area where the string is located in the image. If not specified, binding will still be created with coordinates [0,0,0,0]:

{
  "bindings": [
    {
       "contextUid": "25137b65-e075-4341-8362-14b1a3e558f5",
       "stringHashcode": "bd603147d945h3ec74d6874422ebe4e0",
       "coordinates": {
          "top": 50,
          "left": 50,
          "width": 400,
          "height": 400
       }
    }
  ]
}

For HTML context, each binding may have the selector element with anchors array, specifying the enclosing the string HTML elements with the corresponding value of the data-sl-anchor attribute. Each anchor value can have up to 20 characters and consist of the following characters: 0-9 (more preferably), A-Z, a-z, .-_. If not specified, binding will still be created with the empty anchors array, effectively making it not anchored to a particular element and thus invisible in CAT Tool:

{
  "bindings": [
    {
       "contextUid": "25137b65-e075-4341-8362-14b1a3e558f5",
       "stringHashcode": "bd603147d945h3ec74d6874422ebe4e0",
       "selector": {
          "anchors": ["11", "22", "aa-33"]
       }
    }
  ]
}

For VIDEO context, each binding has the timecode data, specifying the start and end time of the string appearance in the video:

{
  "bindings": [
    {
        "contextUid": "25137b65-e075-4341-8362-14b1a3e558f5",
        "stringHashcode": "bd603147d945h3ec74d6874422ebe4e0",
        "timecode": {
           "startTime": 1203,
           "endTime": 1450
        }
    }
  ]
}