Added WebP member to the ImageEncoding enumeration.
Changed GcBitmap.Load() method overloads to accept images in WebP format.
Added overloads GcBitmap.SaveAsWebp() method to save the images in WebP format.
Changed Image.FromFile(), Image.FromStream(), Image.FromBytes() methods to accept images in WebP format.
Added GcImaging.Skia (new package GrapeCity.Documents.Imaging.Skia) class representing a rendering engine for drawing text and graphics based on SkiaSharp.
Added GcSkiaBitmap class representing a SkiaSharp.SKBitmap with an object model similar to GcBitmap.
Added GcSkiaImage class representing an immutable image based on SkiaSharp.SKImage.
Added GcSkiaGraphics class which implements a drawing surface based on SkiaSharp.SKSurface and SkiaSharp.SKCanvas.