Add Dialog Template [Granite.Dialog]

Registered by Victor Martinez

Every GTK application implements its own dialogs over and over again. The problem is that usually these dialogs don't follow the HIG and are not consistent across the applications. By adding a dialog template built on top of Gtk.Dialog we could adress these issues.

We would take care of the following:

* Using the right padding and spacing
* Adding an option to easily show a help button
* Set the dialog type and use the proper icon
* Don't allow window titles
* plus all the features that Gtk.Dialog already supports

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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