Indicate and disable currently-outdated features #1660
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Description
Eh, I mean, it's an idea.
This implements the ability to mark a feature as outdated and completely nonfunctional in the metadata. Outdated scripts aren't run even if enabled* and are marked visually in the preferences popup. This might make sense for a feature we expect to be outdated (only) in the short term; I feel like it's better than hiding the feature and having people wonder if they imagined it existing this whole time.
Related: #1526, which uses the "deprecation" mechanism to make a outdated feature not appear to new users until it's back to functioning correctly (particularly makes sense for long-term-outdated features). Probably makes sense to implement an overarching strategy addressing both of these things, maybe with a single flag; I haven't fully thought it through.
*currently not true if you toggle them on, or off and on; I guess I'd need to refactor to fix this
Testing steps