Rebalances Krav Maga for Stamina Combat

[Inadvizable]

What Does This PR Do

Leg Sweep: Now a 4 second knockdown instead of a hard stun.
Neck Chop: Unchanged.
Lung Punch: 30 stamina damage, 10 seconds loss of breath. (4 hits to stamina crit)
A redundant check for whether the target is weakened or horizontal was also simplified (weakened people are horizontal).

Why It's Good For The Game

Leg Sweep: Currently an instant stunlock (you may be able to click the attacker once inbetween stuns if you have good ping, are able bodied, and have good reflexes) that ends with you dying quickly. Not good. Knockdown still allows the user to make use of krav maga's extra damage vs horizontal people, but the victim can actually try to do anything about it. 4 seconds might sound long, but it also prevents the user from knocking your weapons out of your hands constantly.
Neck Chop: This move is fine for antags using krav maga, but it was overshadowed before by...
Lung Punch: 20 oxyloss damage + 10 seconds of losebreath meant that the target would be in gasp town, mostly invalidating neck chop as this was also a good damage move. With 30 stamina damage, 4 hits can be used to stamina crit someone - the losebreath will cause about 50 oxy damage, which will then clear by itself.

Changelog

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tweak: Krav maga leg sweep is now a knockdown. Lung punch now deals 30 stamina damage instead of 20 respiratory damage.
/:cl: