As the title says, add a download limiter for avatars.
If avatar size exceeds N value then skip download and show a gray avatar instead.
This way we don't need to wait for large avatars to download and will actually free up a lot of memory and cache space.
Also partially creating it for the meme, but it would actually be nice to have as I really don't want to go into public worlds and download extremely large avatar files as I'd probably hide the avatar anyway.