Possible fix for bloody feet flaky test

[Drulikar]

About the pull request

This PR does a few things:

• The clear_blood timer now hands a weakref to the mob instead of a hardref (I think normally things would handle a hardref in a timer because of the src of the timer getting deleted, but I guess elements don't get deleted soo)
• Adds a conscious check when a human is crossing blood and moving
• Variable cleanup

Explain why it's good for the game

Should fix #12722 and should fix #12770 or we'll see it come up again.

REF SEARCH Found /mob/living/carbon/human [0x300008b] in list Datums -> /datum/callback [0x210310a4] (obj: /datum/element/bloody_feet proc: clear_blood args: ["the unknown"] -> arguments (list).

Testing Photographs and Procedure

Screenshots & Videos

Murder

Changelog

🆑 Drathek
fix: You now need to be conscious for bloody footprints to apply
code: Cleaned up code regarding bloody footprints and hopefully eliminated the cause of flaky tests
/:cl:

resolved