[META] Changes to NSFW / Combat footage posts

In consideration of those who use UI's that autoplay videos, and that posts would show up in /All, the rules for posts containing combat footage have been changed:

From now on, any new post containing combat footage should have "[Combat]" in its title. If any of the footage contains visible humans in combat, alive, injured, or otherwise, then the post must have the NSFW flag checkmarked.

As always, extreme violence, and gore are still prohibited.

Thank you for your understanding.