Change how actions are stored in Object Model

Example:
{
  ...
  "?": {
    ...
    "_actions": {
      "action_id": {
        "action_name": "name",
        "enabled": true
      }
    }
    ...
  }
  ...
}

Partially-Implements: blueprint application-actions
Change-Id: I9b6a35a4eb236f18e03b9e14b6943ee8dee7748f
Merge "Change how actions are stored in Object Model"