added database driven system configurations with admin screen (#647)

src/Form/SystemConfigurationForm.php

@@ -0,0 +1,50 @@
+<?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\Form;
+
+use App\Form\Model\SystemConfiguration;
+use App\Form\Type\SystemConfigurationType;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\CollectionType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * Defines the form used to edit one section within the system configuration.
+ */
+class SystemConfigurationForm extends AbstractType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $builder->add('configuration', CollectionType::class, [
+            'entry_type' => SystemConfigurationType::class,
+            'entry_options' => ['label' => false],
+            'allow_add' => false,
+            'allow_delete' => false,
+            'label' => false,
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults([
+            'data_class' => SystemConfiguration::class,
+            'csrf_protection' => true,
+            'csrf_field_name' => '_token',
+            'csrf_token_id' => 'edit_user_preferences',
+        ]);
+    }
+}