improve configurations for usage in multi-environment setups (#1775)

src/DependencyInjection/AppExtension.php

@@ -54,7 +54,7 @@ class AppExtension extends Extension
 
         // safe alternatives to %kernel.project_dir%
         $container->setParameter('kimai.data_dir', $config['data_dir']);
-        $container->setParameter('kimai.plugin_dir', $config['plugin_dir']);
+        $container->setParameter('kimai.plugin_dir', $container->getParameter('kernel.project_dir') . '/var/plugins');
 
         $this->setLanguageFormats($config['languages'], $container);
         unset($config['languages']);

src/DependencyInjection/Configuration.php

@@ -46,13 +46,7 @@ class Configuration implements ConfigurationInterface
                     ->end()
                 ->end()
                 ->scalarNode('plugin_dir')
-                    ->isRequired()
-                    ->validate()
-                        ->ifTrue(function ($value) {
-                            return !file_exists($value);
-                        })
-                        ->thenInvalid('Plugin directory does not exist')
-                    ->end()
+                    ->setDeprecated('Changing the plugin directory via "kimai.plugin_dir" is not supported since 1.9')
                 ->end()
                 ->append($this->getUserNode())
                 ->append($this->getTimesheetNode())