0.6.x: Escape button should close more dialog windows

[gonX]

Description

Currently missing:

• Tablet Debugger
• Device String Reader

Already works:

• Plugin Manager
• About Window
• Area Converter
• Guide (Setup Wizard)
• (Advanced) Binding Editor

Acknowledgements

• I have searched the existing issues and this new issue is not a duplicate of any.
• I have written a concise and meaningful title.
• I am on the latest version of OpenTabletDriver.