Add support for blocking screenshots from being taken

[grrrrr]

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** Describe the feature request below **

I am aware that this is not a perfect privacy solution and there are ways around it but it would be useful to have jerboa block the ability to take screenshots and somewhat compliments dessalines/jerboa/issues/572

While the risks / concerns of someone remotely taking a screenshot of jerboa on most peoples devices phone are low there are still users who may be more high risk, it is a possibility that some malware is setup to take screenshots of the recorded data and could result in issues in restrictive countries

Additionally with screenshots blocked, switching apps would result in you seeing jerboa is your list of open apps but not seeing the screen it's contents, an extra benefit

My suggestion would be to add a toggle allowing users to opt-in to this feature,.

Some apps that do that have this option if examples/comparison is needed

• KeepassDX (always blocked)
• Signal (allows toggling screenshot capture on or off)
• ProtonMail (allows toggling screenshot capture on or off)
• Aegis (allows toggling screenshot capture on or off)
• MediLog (allows toggling screenshot capture on or off)
• RedReader (allows toggling screenshot capture on or off)
• Quacker & Fritter (allows toggling screenshot capture on or off)

[twizmwazin]

Should be pretty simple, let's make it optional though https://stackoverflow.com/questions/28606689/how-to-prevent-screen-capture-in-android