Add cssClass Dialog Shortcuts Parameters

[Simone4e]

Is your feature request related to a problem? Please describe.

It's not really a problem, in terms of code optimization it would be nice to have the "cssClass" property to allow developers to set a class for all dialogs. In my case a class to make the dialog scrollable.

Describe the solution you'd like

Simply add this entry as a default entry

var app = new Framework7({
  dialog: {
    ...
    cssClass: 'class',
    ...
  }
});

Describe alternatives you've considered

At the moment I have to put it in each dialogmanually.

[nolimits4web]

If you want to add it to every dialog, then it is even better to use just .dialog class which all dialogs have