refactor some event handling

add concept of blocking events

SharedLibraryCore/Commands/UnlinkClientCommand.cs

@@ -3,6 +3,13 @@ using System.Threading.Tasks;
 
 namespace SharedLibraryCore.Commands
 {
+    /// <summary>
+    /// Provides a way for administrators to "unlink" linked accounts
+    /// This problem is common in IW4x where the client identifier is a file
+    /// that is commonly transmitted when uploading and sharing the game files
+    /// This command creates a new link and assigns the guid, and all aliases with the current IP
+    /// associated to the provided client ID to the new link
+    /// </summary>
     public class UnlinkClientCommand : Command
     {
         public UnlinkClientCommand() :