Add a lint check for trait placement on hardcoded actor names.

OpenRA.Mods.Common/Traits/Player/MissionObjectives.cs

@@ -35,6 +35,7 @@ namespace OpenRA.Mods.Common.Traits
 		}
 	}
 
+	[TraitLocation(SystemActors.Player)]
 	public class MissionObjectivesInfo : TraitInfo
 	{
 		[Desc("Set this to true if multiple cooperative players have a distinct set of " +
@@ -258,6 +259,7 @@ namespace OpenRA.Mods.Common.Traits
 		}
 	}
 
+	[TraitLocation(SystemActors.World)]
 	[Desc("Provides game mode progress information for players.",
 		"Goes on WorldActor - observers don't have a player it can live on.",
 		"Current options for PanelName are 'SKIRMISH_STATS' and 'MISSION_OBJECTIVES'.")]
@@ -271,6 +273,7 @@ namespace OpenRA.Mods.Common.Traits
 		public override object Create(ActorInitializer init) { return new ObjectivesPanel(this); }
 	}
 
+	[TraitLocation(SystemActors.World)]
 	public class ObjectivesPanel : IObjectivesPanel
 	{
 		readonly ObjectivesPanelInfo info;