Remove redundant constructors

OpenRA.Mods.RA/Buildings/Demolishable.cs

@@ -23,8 +23,6 @@ namespace OpenRA.Mods.RA
 
 	public class Demolishable : IDemolishable
 	{
-		public Demolishable() { }
-
 		public void Demolish(Actor self, Actor saboteur)
 		{
 			self.Kill(saboteur);

OpenRA.Mods.RA/Console/DevCommands.cs

@@ -22,8 +22,6 @@ namespace OpenRA.Mods.RA
 	{
 		World world;
 
-		public DevCommands() { }
-
 		public void WorldLoaded(World w, WorldRenderer wr)
 		{
 			world = w;

OpenRA.Mods.RA/Console/PlayerCommands.cs

@@ -19,8 +19,6 @@ namespace OpenRA.Mods.RA
 	{
 		World world;
 
-		public PlayerCommands() { }
-
 		public void WorldLoaded(World w, WorldRenderer wr)
 		{
 			world = w;