Removed unused usings, and fixed an icon issue.

src/Greenshot.Base/Core/ImageIO.cs

@@ -30,7 +30,6 @@ using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Windows.Forms;
-using Dapplo.Windows.Icons;
 using Greenshot.Base.Controls;
 using Greenshot.Base.Core.Enums;
 using Greenshot.Base.Core.FileFormatHandlers;

src/Greenshot.Base/Core/PluginUtils.cs

@@ -22,7 +22,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Diagnostics;
 using System.Drawing;
 using System.IO;
 using System.Windows.Forms;
@@ -160,8 +159,11 @@ namespace Greenshot.Base.Core
             try
             {
                 var appIcon = IconHelper.ExtractAssociatedIcon<Bitmap>(path, index, CoreConfig.UseLargeIcons);
-                Debug.Assert(appIcon != null && (appIcon.Width*appIcon.Height > 0), "Invalid icon");
+                if (appIcon != null)
-                Log.DebugFormat("Loaded icon for {0}, with dimensions {1}x{2}", path, appIcon.Width, appIcon.Height);
+                {
+                    Log.DebugFormat("Loaded icon for {0}, with dimensions {1}x{2}", path, appIcon.Width, appIcon.Height);
+                    return appIcon;
+                }
                 return appIcon;
             }
             catch (Exception exIcon)

src/Greenshot.Base/Interfaces/Drawing/IDrawableContainer.cs

@@ -22,7 +22,6 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
-using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Windows.Forms;
 using Dapplo.Windows.Common.Structs;

src/Greenshot.Base/Interfaces/Ocr/Line.cs

@@ -19,7 +19,6 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-using System.Drawing;
 using Dapplo.Windows.Common.Extensions;
 using Dapplo.Windows.Common.Structs;
 

src/Greenshot.Editor/FileFormatHandlers/DibFileFormatHandler.cs

@@ -26,7 +26,6 @@ using System.Drawing.Imaging;
 using System.IO;
 using System.Runtime.InteropServices;
 using Dapplo.Windows.Common.Structs;
-using Dapplo.Windows.Common.TypeConverters;
 using Dapplo.Windows.Gdi32.Enums;
 using Dapplo.Windows.Gdi32.Structs;
 using Greenshot.Base.Core;

src/Greenshot.Editor/Forms/ColorPickerToolStripButton.cs

@@ -20,7 +20,6 @@
  */
 
 using System;
-using System.Diagnostics;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.Windows.Forms;