Move production icon sequence from Tooltip to Buildable

OpenRA.Mods.Common/Traits/Buildable.cs

@@ -34,6 +34,9 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Force a specific faction variant, overriding the faction of the producing actor.")]
 		public readonly string ForceFaction = null;
 
+		[Desc("Sequence of the actor that contains the icon.")]
+		[SequenceReference] public readonly string Icon = "icon";
+
 		[Desc("Palette used for the production icon.")]
 		[PaletteReference] public readonly string IconPalette = "chrome";
 

OpenRA.Mods.Common/Traits/Tooltip.cs

@@ -42,9 +42,6 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Show the actor's owner and their faction flag")]
 		public readonly bool ShowOwnerRow = true;
 
-		[Desc("Sequence of the actor that contains the cameo.")]
-		public readonly string Icon = "icon";
-
 		public override object Create(ActorInitializer init) { return new Tooltip(init.Self, this); }
 
 		public string TooltipForPlayerStance(Stance stance)