Make Tails Installer work on Windows

There needs to be a decision made as to which versions of Windows will be supported by Tails Installer.

Looking at the diff between the upstream liveusb-creator and Tails’ fork the changes in the Windows-specific class are minimal.

Hopefully porting Tails’ changes to work with Windows—if needed—shouldn’t be terribly difficult.

Team: kurono, kytv (testing, possibly some coding if he can learn fast enough)

Original created by @intrigeri on 8550 (Redmine)

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