Added a bunch of TraitLocationAttributes

Also moved a few traits to their proper subfolders.

OpenRA.Mods.D2k/Traits/Player/HarvesterInsurance.cs

@@ -15,6 +15,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.D2k.Traits
 {
+	[TraitLocation(SystemActors.Player)]
 	[Desc("A player with this trait will receive a free harvester when his last one gets eaten by a sandworm, provided he has at least one refinery.")]
 	public class HarvesterInsuranceInfo : TraitInfo
 	{

OpenRA.Mods.D2k/Traits/World/D2kFogPalette.cs

@@ -16,6 +16,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.D2k.Traits
 {
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
 	class D2kFogPaletteInfo : TraitInfo
 	{
 		[PaletteDefinition]

OpenRA.Mods.D2k/Traits/World/PaletteFromScaledPalette.cs

@@ -17,6 +17,7 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.D2k.Traits
 {
+	[TraitLocation(SystemActors.World | SystemActors.EditorWorld)]
 	[Desc("Create a palette by applying a scale and offset to the colors in another palette.")]
 	class PaletteFromScaledPaletteInfo : TraitInfo
 	{