Rebalances being a lardass (#1417)

## About The Pull Request

The overweight quirk no longer makes you fat all the time, and works
like it did before the upstream merge, with applying just a 50%
movespeed penalty.
Being overweight is now a negative trait, worth -4.

Adds a new quirk: Obese. It works like the current overweight quirk
where it makes you fat AND applies a 50% movespeed penalty.

## Why It's Good For The Game

Upstream made the overweight quirk make you fat and apply a custom 50%
movespeed penalty. This means that on top of the existing fat movespeed
penalty, it also gave you a 50% movespeed penalty which made you movie
at Snellie speed. This PR fixes that while also adding a new trait in
case people want that for some reason.


## Proof Of Testing

Untested. Uncompiled. Unhinged.

## Changelog

🆑 BurgerBB
balance: Rebalances the overweight quirk, and adds a new obese quirk.
/🆑

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---------

Co-authored-by: Swift <jackwars4@gmail.com>
Co-authored-by: The Sharkening <95130227+StrangeWeirdKitten@users.noreply.github.com>

code/controllers/subsystem/processing/quirks.dm

@@ -39,6 +39,7 @@ GLOBAL_LIST_INIT_TYPED(quirk_blacklist, /list/datum/quirk, list(
 	//SKYRAT EDIT ADDITION END
 	//BUBBER EDIT ADDITION BEGIN
 	list(/datum/quirk/featherweight, /datum/quirk/oversized),
+	list(/datum/quirk/overweight, /datum/quirk/obese),
 	//BUBBER EDIT ADDITION END
 ))