redundant usings (#960)

Author: SimonCropp

src/ImageSharp.Drawing/Primitives/ShapeRegion.cs

@@ -5,7 +5,6 @@
 using System.Buffers;
 
 using SixLabors.ImageSharp.Memory;
-using SixLabors.Memory;
 using SixLabors.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Brushes.cs

@@ -1,8 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
-
 namespace SixLabors.ImageSharp.Processing
 {
     /// <summary>

src/ImageSharp.Drawing/Processing/ColorStop.cs

@@ -3,8 +3,6 @@
 
 using System.Diagnostics;
 
-using SixLabors.ImageSharp.PixelFormats;
-
 namespace SixLabors.ImageSharp.Processing
 {
     /// <summary>

src/ImageSharp.Drawing/Processing/Extensions/DrawBezierExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Extensions/DrawLineExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Extensions/DrawPathCollectionExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.Shapes;
 
 namespace SixLabors.ImageSharp.Processing

src/ImageSharp.Drawing/Processing/Extensions/DrawPathExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Extensions/DrawPolygonExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Extensions/DrawRectangleExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.Primitives;
 using SixLabors.Shapes;
 

src/ImageSharp.Drawing/Processing/Extensions/DrawTextExtensions.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using SixLabors.Fonts;
-using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Processing.Processors.Text;
 using SixLabors.Primitives;