Hide all UI in screenshots

[Timfa2112]

Checklist

• I've searched the issues and pull requests for similar looking suggestions.
• I've checked the Unreleased section of the changelog for newly added features that sound like my suggestion.

Describe your Suggestion

Like the feature to hide chat when a screenshot is made, I'd like it if I could make it so that the entire UI is hidden during a screenshot.

Reasoning

Added privacy for when you have a friends list open during a screenshot, or an image of your bank or inventory that you might not want to show.