Replace F extension with string interpolation

OpenRA.Game/Primitives/Rectangle.cs

@@ -126,7 +126,7 @@ namespace OpenRA.Primitives
 
 		public override string ToString()
 		{
-			return "{0},{1},{2},{3}".F(X, Y, Width, Height);
+			return $"{X},{Y},{Width},{Height}";
 		}
 	}
 }

OpenRA.Game/Primitives/Size.cs

@@ -66,7 +66,7 @@ namespace OpenRA.Primitives
 
 		public override string ToString()
 		{
-			return string.Format("{{Width={0}, Height={1}}}", Width, Height);
+			return $"{{Width={Width}, Height={Height}}}";
 		}
 	}
 }

OpenRA.Game/Primitives/SpatiallyPartitioned.cs

@@ -33,7 +33,7 @@ namespace OpenRA.Primitives
 		void ValidateBounds(T actor, Rectangle bounds)
 		{
 			if (bounds.Width == 0 || bounds.Height == 0)
-				throw new ArgumentException("Bounds of actor {0} are empty.".F(actor), nameof(bounds));
+				throw new ArgumentException($"Bounds of actor {actor} are empty.", nameof(bounds));
 		}
 
 		public void Add(T item, Rectangle bounds)

OpenRA.Game/Primitives/TypeDictionary.cs

@@ -64,12 +64,12 @@ namespace OpenRA.Primitives
 			if (!data.TryGetValue(t, out var ret))
 			{
 				if (throwsIfMissing)
-					throw new InvalidOperationException("TypeDictionary does not contain instance of type `{0}`".F(t));
+					throw new InvalidOperationException($"TypeDictionary does not contain instance of type `{t}`");
 				return null;
 			}
 
 			if (ret.Count > 1)
-				throw new InvalidOperationException("TypeDictionary contains multiple instances of type `{0}`".F(t));
+				throw new InvalidOperationException($"TypeDictionary contains multiple instances of type `{t}`");
 			return ret[0];
 		}
 

OpenRA.Game/Primitives/float3.cs

@@ -58,7 +58,7 @@ namespace OpenRA
 			return obj is float3 o && (float3?)o == this;
 		}
 
-		public override string ToString() { return "{0},{1},{2}".F(X, Y, Z); }
+		public override string ToString() { return $"{X},{Y},{Z}"; }
 
 		public static readonly float3 Zero = new float3(0, 0, 0);
 		public static readonly float3 Ones = new float3(1, 1, 1);