misc: Add allocation limit to try_vec!

[Serial-ATA]

This adds an arbitrary allocation limit of 8MB for any one item, which should be more than enough in any case.

This was changed to stop the fuzz tests from failing with OOM errors.

[hinto-janai]

Does this include Picture's?

I'm sure I have some audio files with enormous embedded images (although probably not >8MB...?)

I'll scan all of them and report back.

[Serial-ATA]

Yeah, this includes pictures as well. I haven't encountered any image >8MB in my experience.

[hinto-janai]

I have a few that are 5.1 MB. Is there a downside to increasing the limit to just before the fuzz tests start failing?

[Serial-ATA]

The fuzz tests would OOM at different points depending on the system.

I think 8MB is probably a safe size. Having a single tag item >8MB seems a little crazy to me. Unless there's something I'm not thinking of.

Do note that the limit is arbitrary, it can always be increased later if it becomes an issue.

[hinto-janai]

Ok, sounds good.

[Serial-ATA]

Actually, it wouldn't hurt to make this configurable in ParseOptions eventually. I'll make an issue for that.