Ports the radiation subsystem and cleans up damage flags. (#15715)

code/game/objects/structures/grille.dm

@@ -74,7 +74,7 @@
 	//20% chance that the grille provides a bit more cover than usual. Support structure for example might take up 20% of the grille's area.
 	//If they click on the grille itself then we assume they are aiming at the grille itself and the extra cover behaviour is always used.
 	switch(Proj.damage_type)
-		if(BRUTE)
+		if(DAMAGE_BRUTE)
 			//bullets
 			if(Proj.original == src || prob(20))
 				Proj.damage *= between(0, Proj.damage/60, 0.5)
@@ -83,7 +83,7 @@
 			else
 				Proj.damage *= between(0, Proj.damage/60, 1)
 				passthrough = 1
-		if(BURN)
+		if(DAMAGE_BURN)
 			//beams and other projectiles are either blocked completely by grilles or stop half the damage.
 			if(!(Proj.original == src || prob(20)))
 				Proj.damage *= 0.5
@@ -91,7 +91,7 @@
 
 	if(passthrough)
 		. = PROJECTILE_CONTINUE
-		damage = between(0, (damage - Proj.damage)*(Proj.damage_type == BRUTE? 0.4 : 1), 10) //if the bullet passes through then the grille avoids most of the damage
+		damage = between(0, (damage - Proj.damage)*(Proj.damage_type == DAMAGE_BRUTE? 0.4 : 1), 10) //if the bullet passes through then the grille avoids most of the damage
 
 	src.health -= damage*0.2
 	spawn(0) healthcheck() //spawn to make sure we return properly if the grille is deleted