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Summary
We want to make Texture build with recent tools like Xcode 15. Part of this is bumping the minimum supported OS to iOS 14.
I only removed the dead code (i.e. code gated on versions older than iOS 14). There are still some warnings about outdated APIs in use, but they are non-trivial changes to fix. Also, several of the examples rely on remote media (images or videos) that no longer exist. If they were trivially fixable, I fixed them. If not, I left them.
Test plan
Run all the examples and verify it works as I expect. Run all the unit tests and make them pass.