Fix projectiles to use IRulesetLoaded properly

OpenRA.Game/GameRules/Ruleset.cs

@@ -67,6 +67,19 @@ namespace OpenRA
 
 			foreach (var weapon in Weapons)
 			{
+				var projectileLoaded = weapon.Value.Projectile as IRulesetLoaded<WeaponInfo>;
+				if (projectileLoaded != null)
+				{
+					try
+					{
+						projectileLoaded.RulesetLoaded(this, weapon.Value);
+					}
+					catch (YamlException e)
+					{
+						throw new YamlException("Projectile type {0}: {1}".F(weapon.Key, e.Message));
+					}
+				}
+
 				foreach (var warhead in weapon.Value.Warheads)
 				{
 					var cacher = warhead as IRulesetLoaded<WeaponInfo>;