Move ShroudRenderer into a trait.

mods/cnc/rules/system.yaml

@@ -277,6 +277,7 @@ World:
 	ShroudPalette@combined:
 		Name: shroudfog
 		Type: Combined
+	ShroudRenderer:
 	Country@gdi:
 		Name: GDI
 		Race: gdi

mods/d2k/rules/system.yaml

@@ -429,6 +429,7 @@ World:
 	ShroudPalette@combined:
 		Name: shroudfog
 		Type: Combined
+	ShroudRenderer:
 	Country@Atreides:
 		Name: Atreides
 		Race: atreides

mods/ra/rules/system.yaml

@@ -620,6 +620,7 @@ World:
 	ShroudPalette@combined:
 		Name: shroudfog
 		Type: Combined
+	ShroudRenderer:
 	Country@0:
 		Name: Allies
 		Race: allies

mods/ts/rules/system.yaml

@@ -105,6 +105,7 @@ World:
 	ShroudPalette@combined:
 		Name: shroudfog
 		Type: Combined
+	ShroudRenderer:
 	VoxelNormalsPalette@normals:
 		Name: normals
 		Type: TiberianSun