Remove the now-redundant ScriptInvulnerable trait.

mods/ra/maps/desert-shellmap/desert-shellmap.lua

@@ -109,8 +109,8 @@ end
 
 SetupAlliedUnits = function()
 	Utils.Do(Map.NamedActors, function(a)
-		if a.Owner == allies and a.HasProperty("Invulnerable") then
-			a.Invulnerable = true
+		if a.Owner == allies and a.HasProperty("AcceptsUpgrade") and a.AcceptsUpgrade("unkillable") then
+			a.GrantUpgrade("unkillable")
 			a.Stance = "Defend"
 		end
 	end)

mods/ra/maps/desert-shellmap/map.yaml

@@ -1295,19 +1295,20 @@ Rules:
 		Health:
 			HP: 200
 	^Vehicle:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
 		GainsExperience:
 			Upgrades:
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	^Tank:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
 		GainsExperience:
 			Upgrades:
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	^Infantry:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
 		GainsExperience:
@@ -1318,20 +1319,25 @@ Rules:
 			VolumeMultiplier: 0.1
 		DeathSounds@ZAPPED:
 			VolumeMultiplier: 0.1
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	^Ship:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
 		GainsExperience:
 			Upgrades:
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	^Plane:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	^Building:
-		ScriptInvulnerable:
 		GivesBounty:
 			Percentage: 0
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 
 Sequences:
 

mods/ra/maps/fort-lonestar/fort-lonestar.lua

@@ -147,7 +147,7 @@ WorldLoaded = function()
 
 	Utils.Do(Snipers, function(a)
 		if a.Owner == soviets then
-			a.Invulnerable = true
+			a.GrantUpgrade("unkillable")
 		end
 	end)
 

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

@@ -665,7 +665,8 @@ Rules:
 			HP: 200
 		AutoTarget:
 			InitialStance: Defend
-		ScriptInvulnerable:
+		InvulnerabilityUpgrade@UNKILLABLE:
+			RequiresUpgrade: unkillable
 	SPY:
 		Inherits: ^Infantry
 		Buildable: