Add support for multiple explosions to CreateEffectWarhead

Have the engine pick one explosion at random from the provided list.

mods/ra/maps/allies-05a/map.yaml

@@ -1834,7 +1834,7 @@ Weapons:
 				Concrete: 0
 			DamageTypes: Prone50Percent, TriggerProne, BulletDeath
 		Warhead@2Eff: CreateEffect
-			Explosion: piffs
+			Explosions: piffs
 			InvalidImpactTypes: Water
 
 Voices:

mods/ra/maps/drop-zone-w/map.yaml

@@ -289,7 +289,7 @@ Weapons:
 			Damage: 250
 			DamageTypes: Prone50Percent, TriggerProne, BulletDeath
 		Warhead@1Eff: CreateEffect
-			Explosion: large_explosion
+			Explosions: large_explosion
 			WaterExplosion: large_splash
 			ImpactSound: kaboom12.aud
 			WaterImpactSound: splash9.aud
@@ -317,7 +317,7 @@ Weapons:
 			Damage: 400
 			DamageTypes: Prone50Percent, TriggerProne, ExplosionDeath
 		Warhead@1Eff: CreateEffect
-			Explosion: large_explosion
+			Explosions: large_explosion
 			WaterExplosion: large_splash
 			ImpactSound: kaboom12.aud
 			WaterImpactSound: splash9.aud

mods/ra/maps/fort-lonestar/map.yaml

@@ -816,7 +816,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3Eff: CreateEffect
-			Explosion: self_destruct
+			Explosions: self_destruct
 			WaterExplosion: self_destruct
 	MammothTusk:
 		ReloadDelay: 300
@@ -850,7 +850,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3Eff: CreateEffect
-			Explosion: nuke
+			Explosions: nuke
 			WaterExplosion: nuke
 	TankNapalm:
 		ReloadDelay: 40
@@ -879,7 +879,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Scorch
 		Warhead@3Eff: CreateEffect
-			Explosion: small_explosion
+			Explosions: small_explosion
 			WaterExplosion: small_explosion
 			ImpactSound: firebl3.aud
 	ParaBomb:
@@ -901,7 +901,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 			WaterExplosion: napalm
 	155mm:
@@ -931,7 +931,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Scorch
 		Warhead@3Eff: CreateEffect
-			Explosion: small_napalm
+			Explosions: small_napalm
 			WaterExplosion: small_napalm
 			ImpactSound: firebl3.aud
 	FLAK-23:
@@ -956,7 +956,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Scorch
 		Warhead@3Eff: CreateEffect
-			Explosion: med_explosion
+			Explosions: med_explosion
 	SCUD:
 		ReloadDelay: 280
 		Range: 7c0
@@ -984,7 +984,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3Eff: CreateEffect
-			Explosion: nuke
+			Explosions: nuke
 			WaterExplosion: large_splash
 			ImpactSound: kaboom1.aud
 			WaterImpactSound: kaboom1.aud
@@ -1004,7 +1004,7 @@ Weapons:
 			Damage: 150
 			DamageTypes: Prone50Percent, TriggerProne, BulletDeath
 		Warhead@2Eff: CreateEffect
-			Explosion: piffs
+			Explosions: piffs
 
 Voices:
 

mods/ra/maps/monster-tank-madness/map.yaml

@@ -2404,10 +2404,10 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3EffGround: CreateEffect
-			Explosion: small_explosion
+			Explosions: small_explosion
 			InvalidImpactTypes: Water
 		Warhead@4EffWater: CreateEffect
-			Explosion: small_splash
+			Explosions: small_splash
 			ValidImpactTypes: Water
 
 Voices:

mods/ra/maps/soviet-02b/map.yaml

@@ -670,7 +670,7 @@ Weapons:
 			Size: 2,1
 			Delay: 5
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 			Delay: 5
 

mods/ra/maps/soviet-03/map.yaml

@@ -1290,7 +1290,7 @@ Weapons:
 			Size: 2,1
 			Delay: 5
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 			Delay: 5
 

mods/ra/maps/soviet-07/map.yaml

@@ -891,10 +891,10 @@ Weapons:
 				Concrete: 10
 			DamageTypes: Prone50Percent, TriggerProne, BulletDeath
 		Warhead@2Eff: CreateEffect
-			Explosion: piffs
+			Explosions: piffs
 			InvalidImpactTypes: Water
 		Warhead@3EffWater: CreateEffect
-			Explosion: water_piffs
+			Explosions: water_piffs
 			ValidImpactTypes: Water
 	FireballLauncherInterior:
 		ReloadDelay: 65
@@ -918,7 +918,7 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Scorch
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 	MissionBarrelExplodeInterior:
 		Warhead@1Dam: SpreadDamage
@@ -938,7 +938,7 @@ Weapons:
 			Size: 2,1
 			Delay: 5
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 			Delay: 5
 

mods/ra/maps/survival02/map.yaml

@@ -1171,11 +1171,11 @@ Weapons:
 		Warhead@2Smu: LeaveSmudge
 			SmudgeType: Crater
 		Warhead@3Eff: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: firebl3.aud
 			InvalidImpactTypes: Water
 		Warhead@4EffWater: CreateEffect
-			Explosion: napalm
+			Explosions: napalm
 			ImpactSound: splash9.aud
 			ValidImpactTypes: Water