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

OpenRA.Mods.Common/Traits/PaletteEffects/FlashPaletteEffect.cs

@@ -18,6 +18,7 @@ namespace OpenRA.Mods.Common.Traits
 {
 	using GUtil = OpenRA.Graphics.Util;
 
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
 	[Desc("Used for bursted one-colored whole screen effects. Add this to the world actor.")]
 	public class FlashPaletteEffectInfo : TraitInfo
 	{

OpenRA.Mods.Common/Traits/PaletteEffects/MenuPaletteEffect.cs

@@ -17,6 +17,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Traits
 {
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
 	[Desc("Fades the world from/to black at the start/end of the game, and can (optionally) desaturate the world")]
 	public class MenuPaletteEffectInfo : TraitInfo
 	{

OpenRA.Mods.Common/Traits/PaletteEffects/RotationPaletteEffect.cs

@@ -15,6 +15,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.Traits
 {
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
 	[Desc("Palette effect used for sprinkle \"animations\".")]
 	class RotationPaletteEffectInfo : TraitInfo
 	{