Refactoring pass.

- Extract an enum for edges rather than using magic numbers for everything.
- Remove duplicated code between FoggedEdges and ShroudedEdges by hosting the visibility function into a delegate.
- Make minimap methods more readable.
- Tidy formatting.
- Make some fields readonly.
- Remove unused usings.

OpenRA.Game/Traits/Player/FrozenActorLayer.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
  * This file is part of OpenRA, which is free software. It is made
  * available to you under the terms of the GNU General Public License
  * as published by the Free Software Foundation. For more information,
@@ -27,7 +27,7 @@ namespace OpenRA.Traits
 		public readonly Rectangle Bounds;
 		readonly Actor actor;
 
-		public IRenderable[] Renderables { set; private get; }
+		public IRenderable[] Renderables { private get; set; }
 		public Player Owner;
 
 		public string TooltipName;
@@ -84,6 +84,7 @@ namespace OpenRA.Traits
 				return Renderables.Concat(Renderables.Where(r => !r.IsDecoration)
 					.Select(r => r.WithPalette(highlight)));
 			}
+
 			return Renderables;
 		}