add button to copy version information to clipboard for bug reports

[tigert]

Is your feature request related to a problem? Please describe.
It is cumbersome to look up the version information for MobiFlight when reporting a bug.

Describe the solution you'd like
FreeCAD has a nice way to record useful version information to bug reports, and it is also consistent since it is just a copy+paste to the bug report form.

• The bug report form asks the user to "Open Help->About, and click the copy version info button in the about dialog", and then paste it to the bug report.
• In the About dialog has this button

Additionally the text snippet contains information about the operating system version, and it could contain something else we might find useful, like the list of detected devices for example.