Updating Airstrike - destroys guard tower/turret

Airstrike now destroys basic turrets/GT.
Should not destroy most buildings, though. (Apparently some people were complaining about it being usde for "sniping" buildings too much).
To make damage vs. buildings relatively consistent regardless of how many tiles they occupy, napalm has far less spread now, but much more damage.

Vulcan cannon does more damage vs. heavy armor, but does not damage buildings much. This is because damage it did to buildings varied too much based on building footprint.

mods/cnc/weapons.yaml

@@ -747,13 +747,13 @@ Vulcan:
 	Projectile: Bullet
 		Speed: 1c682
 	Warhead:
-		Damage: 75
+		Damage: 100
 		Spread: 426
 		Versus:
 			None: 100%
-			Wood: 50%
+			Wood: 25%
 			Light: 100%
-			Heavy: 25%
+			Heavy: 75%
 		InfDeath: 2
 		Explosion: piffs
 
@@ -766,18 +766,18 @@ Napalm:
 	Projectile: GravityBomb
 		Image: BOMBLET
 	Warhead:
-		Spread: 853
+		Spread: 341
 		Versus:
-			None: 90%
+			None: 100%
 			Wood: 100%
-			Light: 60%
-			Heavy: 55%
+			Light: 75%
+			Heavy: 25%
 		InfDeath: 5
 		Explosion: med_napalm
 		WaterExplosion: med_napalm
 		ImpactSound: flamer2.aud
 		SmudgeType: Scorch
-		Damage: 50
+		Damage: 300
 
 Napalm.Crate:
 	Warhead: