Laravel 7.x Shift (#3011)

* Apply Laravel coding style
* Shift bindings
* Shift core files
* Shift to Throwable
* Add laravel/ui dependency
* Shift Eloquent methods
* Shift config files
* Shift Laravel dependencies
* Shift cleanup
* Shift test config and references
* Applied styleci changes
* Applied fixes post shift to laravel 7

Co-authored-by: Shift <shift@laravelshift.com>

app/Http/Controllers/PageController.php

@@ -176,7 +176,7 @@ class PageController extends Controller
     {
         $page = $this->pageRepo->getById($pageId);
         $page->setHidden(array_diff($page->getHidden(), ['html', 'markdown']));
-        $page->addHidden(['book']);
+        $page->makeHidden(['book']);
 
         return response()->json($page);
     }