Plugin settings - Added SettingSaved event

Meta - Tweak R# ruleset

src/Artemis.Core/Plugins/Settings/PluginSetting.cs

@@ -88,12 +88,18 @@ namespace Artemis.Core
 
             _pluginSettingEntity.Value = JsonConvert.SerializeObject(Value);
             _pluginRepository.SaveSetting(_pluginSettingEntity);
+            OnSettingSaved();
         }
 
         /// <summary>
         ///     Occurs when the value of the setting has been changed
         /// </summary>
-        public event EventHandler<EventArgs> SettingChanged;
+        public event EventHandler SettingChanged;
+
+        /// <summary>
+        ///     Occurs when the value of the setting has been saved
+        /// </summary>
+        public event EventHandler SettingSaved;
 
         /// <inheritdoc />
         public override string ToString()
@@ -108,5 +114,13 @@ namespace Artemis.Core
         {
             SettingChanged?.Invoke(this, EventArgs.Empty);
         }
+
+        /// <summary>
+        ///     Invokes the <see cref="OnSettingSaved" /> event
+        /// </summary>
+        protected internal virtual void OnSettingSaved()
+        {
+            SettingSaved?.Invoke(this, EventArgs.Empty);
+        }
     }
 }