added project start and end date (#1303)

* added sortable js library
* activity in invoice is optional
* added javascript widget for paginated boxes
* fix activity dropdown for globals only
* added timesheet service to reduce code duplication
* use repository to query for teams in dropdowns
* added project validator
* validate project start and end against timesheet
* include begin and end in dynamic form requests for projects
* added timezone and language option to import flag, improve timesheet import speed
* deactivate cross-timezone filter
* add virtual fields to field order list
* composer update
* added param to ignore dates
* position loader icon fixed - fixes #1330
* permission problem when creating a new project - fixes #1340
* remove dev dependencies webserver and thanks bundle
* stop information leak (begin and end date) in duration mode - fixes #1307
* unify timesheet edit dialog for user and admins
* fix security issue, own rates exposed to unauthorized users in multi-update dialog

src/Repository/Query/VisibilityTrait.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Repository\Query;
+
+trait VisibilityTrait
+{
+    /**
+     * @var int
+     */
+    private $visibility = VisibilityInterface::SHOW_VISIBLE;
+
+    public function getVisibility(): int
+    {
+        return $this->visibility;
+    }
+
+    public function setVisibility($visibility)
+    {
+        $visibility = (int) $visibility;
+        if (in_array($visibility, VisibilityInterface::ALLOWED_VISIBILITY_STATES, true)) {
+            $this->visibility = $visibility;
+        }
+
+        return $this;
+    }
+}