Add option for MakeFormCommand to generate a PageType as well

[axyr]

Most of the time a Frontend Form is shown on a dedicated PageType.

To get started on a new frontend Form, right now you have to :

1. Create a CustomForm class (or add a form on the controller, but I consider that bad practice)
2. Create a new PageType/PageType_Controller
3. Add the allowed actions for CustomForm and most of the time a result/thanks Action
4. Create a new PageType.ss Layout template (and maybe even a CustomForm.ss template)
5. Run dev/build?flush=all
6. Go to the cms and create a dummy page

Better would be :

$ php supersake make:frontendform MyCustomForm --page=MyCustomFormPage --title=testform

And this would create :

1. Form skeleton class
2. MyCustomFormPage (or add the allowed_actions/methods if the class already exists)
3. write a dummy page to the database
4. optionally create a MyCustomForm.ss template from stub or framework template.

or :

$ php supersake make:frontendform MyCustomForm --page

That would create a MyCustomFormPage by naming convention {$FormName}Page