Add a toggle to allow screenshots through FLAG_SECURE

[BasedJellyfish11]

issue: GrapheneOS/os-issue-tracker#664

Adds a setting to developer options to disable flag secure globally. Functionality is implemented in PR GrapheneOS/platform_frameworks_base#313

[mio-19]

Why is the toggle in developer options? Because of this I have to turn on developer options to access the toggle. But I don't want to turn on developer options generally

[BasedJellyfish11]

Developer options has the setting to disable screen share protections which seemed loosely related to me, plus this setting alters how apps "normally" work, but I can rehome it if there's somewhere that makes more sense

[mio-19]

How about Security and privacy -> more security and privacy -> privacy

[mio-19]

Why are there 238 files changed and hundred of commits on GitHub webpage

[chenxiaolong]

Why are there 238 files changed and hundred of commits on GitHub webpage

The history of the 16-qpr2 branch was just cleaned up in #414, so any PRs will need to be rebased.

[BasedJellyfish11]

Thanks for the heads up, rebased

@mio-19 I don't think this setting as it is implemented in GrapheneOS/platform_frameworks_base#313 enhances privacy in any way. It just forces screenshots to go through regardless of flag status. Enhancing privacy would fall under something like GrapheneOS/os-issue-tracker#2590, which this doesn't implement at all. Any app that subscribes to these APIs will still know you screenshotted

I guess I'll leave the final decision up to whoever reviews the PR

[mio-19]

How about keeping in developer options but not depending on the "Use developer options"? When I turned off the "Use developer options" I can see some options in the developer options page are still toggleable and the big "Use developer options" option doesn't affect them.