Proper MaxHealth checks and Crit Point (#17704)

* Fixes maxhealth checks not including modifiers and mxHP

Death at:
W/ 100max hp: https://i.imgur.com/nR8DtzG.png
W/ 125max hp: https://i.imgur.com/87eD2hW.png
W/ 25max hp: https://i.imgur.com/SP6rPWc.png

* Crit Point

* small xenochimera fix

* Update game_options.txt

code/datums/components/species/xenochimera.dm

@@ -421,7 +421,7 @@
 	//Unfreeze some things
 	does_not_breathe = FALSE
 	update_canmove()
-	weakened = 2
+	stunned = 2
 
 	xc.revive_ready = world.time + 10 MINUTES //set the cooldown, Reduced this to 10 minutes, you're playing with fire if you're reviving that often.