expose appropriate *Inits, and make them work in editor

OpenRA.Game/ActorReference.cs

@@ -15,8 +15,8 @@ namespace OpenRA.FileFormats
 {
 	public class ActorReference : IEnumerable
 	{
-		public readonly string Type;
-		public readonly TypeDictionary InitDict;
+		public string Type;
+		public TypeDictionary InitDict;
 
 		public ActorReference( string type ) : this( type, new Dictionary<string, MiniYaml>() ) { }
 

OpenRA.Game/GameRules/ActorInfo.cs

@@ -121,8 +121,7 @@ namespace OpenRA
 
 			return inits.Select(
 				i => Pair.New(
-					i.GetType().Name.Replace( "Init", "" ),
-					i.GetType().GetInterfaces()[0].GetGenericArguments()[0] ) );
+					i.Name.Replace( "Init", "" ), i ));
 		}
 	}
 }

OpenRA.Game/Traits/Health.cs

@@ -14,7 +14,7 @@ using OpenRA.GameRules;
 
 namespace OpenRA.Traits
 {
-	public class HealthInfo : ITraitInfo
+	public class HealthInfo : ITraitInfo, UsesInit<HealthInit>
 	{
 		public readonly int HP = 0;
 		public readonly float Radius = 10;