Add globalOverwrites?

[Systerr]

This feature needed if we want to overwrite some default values. For example we want to grab additional attributesToGrab.
Maybe like this.

spiralFrontend.globalOverwrites = {
    instances: {//type
        Form:{
            attributesToGrab:{
                "action2": {
                    "key": "url",
                    "value": "/"
                }
            }
        }

    }
}

Or maybe for change default classes

[Systerr]

I think that for usage like described we should use inheritance.
If any one have suggestion please write it.

[alexichepura]

we came up to the idea of placing variable before sf.js runs.

var sf = {
  defaultOptions: {
    instances: {
      form: {
        messagesType: "spiral"
      }
    }
  }
}

So the sequence to gather options:
0) defaultOptions from instance itself (if need and provided by the instance itself)

1. sf.defaultOptions
2. data-options - should accept JSON string or variable name
3. optionsToGrab

[alexichepura]

Implemented.
data-options is in #4