separate bindinglfags

Pilz.Plugins/PluginManagerT.cs

@@ -187,7 +187,7 @@ namespace Pilz.Plugins
 
                 try
                 {
-                    if (Activator.CreateInstance(type, BindingFlags.Public | BindingFlags.NonPublic, null, parameters, null) is TPluginInterface plugin)
+                    if (Activator.CreateInstance(type, GetConstructorFlags(), null, parameters, null) is TPluginInterface plugin)
                     {
                         if (plugin is IPluginLateInitialization pluginLateInit)
                             pluginLateInit.LateInit();
@@ -205,5 +205,10 @@ namespace Pilz.Plugins
             else
                 result.Status = PluginLoadStatus.NoValidPlugin;
         }
+
+        protected virtual BindingFlags GetConstructorFlags()
+        {
+            return BindingFlags.Public;
+        }
     }
 }