Reorganize commands/models/descriptions

[onhernandes]

Now, every command is separated by a single plain object like

{
  "action": {
    "command": {
      "description": "",
      "exec": "<function>"
    }
  }
}

We could reorganize and keep everything that's related to a model within the model's file.

Like, instead of exporting just the functions, also the descriptions and more. This would make the CLI more flexible because not all of the commands uses the pattern of <action> <command>