Plugins: Refactor existing interfaces into ILoadPipeline

Il2CppInspector.Common/Plugins/API/V100/IPlugin.cs

@@ -40,8 +40,16 @@ namespace Il2CppInspector.PluginAPI.V100
         public string Description { get; }
 
         /// <summary>
-        /// Plugin options
+        /// Plugin options with their current values (or default values on startup where applicable)
         /// </summary>
         public List<IPluginOption> Options { get; }
-    }
+
+        /// <summary>
+        /// Executes when the plugin's options are updated by the user
+        /// Not called on first load (with the default, possibly incomplete options provided by the plugin author)
+        /// Do not perform any long-running operations here
+        /// Implementation is optional. The default is to do nothing
+        /// </summary>
+        void OptionsChanged(PluginOptionsChangedEventInfo e) { }
+   }
 }