Port /datum/status_effect and convert wetness and fire stacks to it (#18180)

* Port /datum/status_effect system

* Port fire stacks to status_effects

* Fixes and adjustments to wetness

* One last little thing

* Fixes these compile errors

A few things on the backend got updated...Adjusts them here.

---------

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/modules/admin/player_effects.dm

@@ -73,7 +73,7 @@
 			if(!istype(Tar))
 				return
 			Tar.adjust_fire_stacks(10)
-			Tar.IgniteMob()
+			Tar.ignite_mob()
 			Tar.visible_message(span_danger("[target] bursts into flames!"))
 
 		if("lightning_strike")

code/modules/admin/verbs/smite.dm

@@ -34,7 +34,7 @@
 
 		if(SMITE_SPONTANEOUSCOMBUSTION)
 			target.adjust_fire_stacks(10)
-			target.IgniteMob()
+			target.ignite_mob()
 			target.visible_message(span_danger("[target] bursts into flames!"))
 
 		if(SMITE_LIGHTNINGBOLT)