Allow users to import .maFiles

[Preport]

New Features

• Added an option to import an maFile on the Authenticator tab to allow users to easily migrate.

Fixes

• [Dev only] Changed the start script so npm start won't crash on windows operating systems.

• Since a new instance of node-steamcommunity was being used for every login attempt captcha wouldn't work. Added a variable that will keep captcha's id to fix that issue.

• An account named "" (Nothing) which is the exact copy of the previous selected account will no longer appear after returning to switch accounts menu or just closing and reopening the app.

• Confirmations can be declined now.

[HilliamT]

Thanks for the pull request Preport! Will double-check the changes and hopefully push for production.