more methods to load plugins

Pilz.Plugins/PluginRuntimeInfoT.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -10,5 +11,6 @@ namespace Pilz.Plugins
     {
         public T? Plugin { get; internal set; }
         public PluginStatus Status { get; internal set; }
+        public Assembly? Assembly { get; internal set; }
     }
 }