Restructure where models are stored (#1476)

The idea is to clean the repository a little bit by moving models into their respective folders.

app/Http/Controllers/SettingsController.php

@@ -2,16 +2,18 @@
 
 namespace App\Http\Controllers;
 
-use App\Tag;
-use App\User;
-use App\ImportJob;
-use App\Invitation;
 use App\Helpers\DBHelper;
+use App\Models\User\User;
+use App\Helpers\DateHelper;
+use App\Models\Contact\Tag;
 use Illuminate\Http\Request;
+use App\Helpers\LocaleHelper;
 use App\Jobs\SendNewUserAlert;
 use App\Jobs\ExportAccountAsSQL;
 use App\Jobs\AddContactFromVCard;
 use App\Jobs\SendInvitationEmail;
+use App\Models\Account\ImportJob;
+use App\Models\Account\Invitation;
 use Illuminate\Support\Facades\DB;
 use App\Notifications\ConfirmEmail;
 use Illuminate\Support\Facades\Auth;
@@ -75,8 +77,8 @@ class SettingsController extends Controller
 
         return view('settings.index')
                 ->withNamesOrder($namesOrder)
-                ->withLocales(\App\Helpers\LocaleHelper::getLocaleList())
-                ->withHours(\App\Helpers\DateHelper::getListOfHours());
+                ->withLocales(LocaleHelper::getLocaleList())
+                ->withHours(DateHelper::getListOfHours());
     }
 
     /**