Add endpoints to manage IPC bans (#2715)

* Add endpoints to manage IPC bans

* Remove debug code

* Misc.

* Simplify unban logic

* Add explanatory comment to new string resource

ArchiSteamFarm/Localization/Strings.Designer.cs

@@ -981,6 +981,15 @@ namespace ArchiSteamFarm.Localization {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to The IP address {0} is not banned!.
+        /// </summary>
+        public static string ErrorIPNotBanned {
+            get {
+                return ResourceManager.GetString("ErrorIPNotBanned", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to {0} is empty!.
         /// </summary>