Add per-app toggle for viewing changelog on app update about meta

[matchboxbananasynergy]

The best way to implement this in my opinion is as follows:

1. have a toggle in settings that will give you the changelog for all apps; so, a global toggle to show changelogs as apps are updated.
2. have a per-app toggle in each app's page for those who only want to check changelogs for some apps, but not all.

If the toggle in Settings is enabled, it'll give you the changelog for all apps. If it's disabled, it'll only do it for the ones you've selected.

Another way to implement this would be for the toggle in Settings to open up a screen with all of your installed apps. That way you can select the apps you want changelogs for, disable those for which you don't want changelogs, and there should be a select/unselect all option as well.

In fact, the more I think about it, implementing it in a way where this is controlled in Settings both globally and per-app makes a lot more sense from a UX perspective to me, instead of having to go to multiple individual app screens to disable it if you later change your mind.