Dashboard widget update (#9515)

Implemented in Laravel
Doesn't use legacy PHP session
Several widgets have new features and settings, for example:

- Multiple ports in one graph
- Maps settings are configurable and override system settings but default to system settings
- Graylog stream and/or device selection
- Much improved graph widget selection
- Many more

DO NOT DELETE THIS TEXT

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app/Http/Controllers/PaginatedAjaxController.php

@@ -46,7 +46,7 @@ abstract class PaginatedAjaxController extends Controller
      * @param \Illuminate\Http\Request $request
      * @return \Illuminate\Database\Eloquent\Builder|\Illuminate\Database\Query\Builder
      */
-    abstract public function baseQuery($request);
+    abstract protected function baseQuery($request);
 
     /**
      * @param Paginator $paginator
@@ -59,7 +59,7 @@ abstract class PaginatedAjaxController extends Controller
      *
      * @return array
      */
-    public function rules()
+    protected function rules()
     {
         return [];
     }
@@ -71,7 +71,7 @@ abstract class PaginatedAjaxController extends Controller
      * @return array
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
-    public function searchFields($request)
+    protected function searchFields($request)
     {
         return [];
     }
@@ -82,7 +82,7 @@ abstract class PaginatedAjaxController extends Controller
      * @param Model $model
      * @return array|Collection|Model
      */
-    public function formatItem($model)
+    protected function formatItem($model)
     {
         return $model;
     }