Merge branch '3.3' into 3.4

* 3.3:
  [DI] Dont resolve envs in service ids
  Add tests proving it can load annotated files
  [WebProfilerBundle] Reset letter-spacing in toolbar
  Prefer overflow-wrap to word-break
  [Routing] Fix "config-file-relative" annotation loader resources
  Make search in debug:container command case-insensitive
  `resolveEnvPlaceholders` will return a mixed value

Author: nicolas-grekas

Command/ContainerDebugCommand.php

@@ -220,9 +220,8 @@ private function findServiceIdsContaining(ContainerBuilder $builder, $name)
     {
         $serviceIds = $builder->getServiceIds();
         $foundServiceIds = array();
-        $name = strtolower($name);
         foreach ($serviceIds as $serviceId) {
-            if (false === strpos($serviceId, $name)) {
+            if (false === stripos($serviceId, $name)) {
                 continue;
             }
             $foundServiceIds[] = $serviceId;