FEATURE #1522: add orbit slider

Had to change some things in global widgets management and also in html code widget. Sorry for this ugly commit..

app/Providers/AppServiceProvider.php

@@ -12,6 +12,7 @@ use App\Handlers\Search\Presenters\AdminContent as AdminContentPresenter;
 use App\Handlers\Search\Presenters\AdminFiles;
 use App\Models\Template;
 use App\Widgets\HtmlCode\HtmlCode;
+use App\Widgets\OrbitSlider\OrbitSlider;
 use Illuminate\Support\Facades\App;
 use Illuminate\Support\Facades\File;
 use Illuminate\Support\ServiceProvider;
@@ -83,6 +84,7 @@ class AppServiceProvider extends ServiceProvider
 
         // register all available widgets
         $registrator->register(HtmlCode::class);
+        $registrator->register(OrbitSlider::class);
     }
 
     /**