API V9 dependency on System.Drawing.Common has been removed

Starting from API V9Preview5, the dependency on System.Drawing.Common has been removed because this nuget is supported only on Windows.

Also, the TryGetProductMenuBitmap method was removed from IProduct, and the TryGetProductGroupMenuBitmap method was removed from IProductGroup. To obtain an image from its byte array, you can use the code from SamplePlugin or use any convenient graphics library.