Dissolve RA.Buildings namespace.

Move a handfull related, loose traits to RA.Traits as well.

OpenRA.Mods.RA/Player/AllyRepair.cs

@@ -8,10 +8,9 @@
  */
 #endregion
 
-using OpenRA.Mods.RA.Buildings;
 using OpenRA.Traits;
 
-namespace OpenRA.Mods.RA
+namespace OpenRA.Mods.RA.Traits
 
 {
 	[Desc("Attach this to the player actor to allow building repair by team mates.")]