Paste Images into Input Tab

[t-martine]

As a security analyst cyber chef ist a quick and private way to extract URLs from QR Codes. The current workflow is to:

1. Screenshot QR Code
2. Save Image
3. Add image as input in CyberChef
4. Extract URL

With this PR, step 2 can be omitted. Just paste your image over the input field and it will be added as a file.

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