Provide support of HotKeys to manage thumbnails and corresponding EVE clients - implemented w/o GUI required to set hotkeys

Eve-O-Preview/Configuration/IApplicationConfiguration.cs

@@ -1,4 +1,5 @@
 using System.Drawing;
+using System.Windows.Forms;
 
 namespace EveOPreview.Configuration
 {
@@ -32,5 +33,8 @@ namespace EveOPreview.Configuration
 
 		ClientLayout GetClientLayout(string currentClient);
 		void SetClientLayout(string currentClient, ClientLayout layout);
+
+		Keys GetClientHotkey(string currentClient);
+		void SetClientHotkey(string currentClient, Keys hotkey);
 	}
 }