Plugin info - Implemented property changed

Plugins - Improved enable failure detection
Plugins UI - Show an indicator on plugins that failed to enable
Plugins UI - Show a progress indicator on plugins that are enabling
UI - Added reusable Snackbar (not the Dutch kind with kroketten)

src/Artemis.Storage/Entities/Plugins/PluginEntity.cs

@@ -8,7 +8,6 @@ namespace Artemis.Storage.Entities.Plugins
     public class PluginEntity
     {
         public Guid Id { get; set; }
-        public Guid PluginGuid { get; set; }
 
         public bool IsEnabled { get; set; }
         public bool LastEnableSuccessful { get; set; }