Implement Input Dialog in Ookii Dialogs WPF #52
Description
The Windows Forms flavor of Ookii Dialogs has an input dialog that can be used to prompt the user for a single piece of text. Its functionality is reminiscent of the Visual Basic InputBox function, only with a cleaner API and UI.
We should implement a WPF version of this dialog in Ookii Dialogs WPF.
This would also help towards #27