Use service tags to inject all voters into StoredObjectVoter.php

Instead of manually injecting services into StoredObjectVoter\
config is added to automatically tag each service that implements\
StoredObjectVoterInterface.php

src/Bundle/ChillDocStoreBundle/config/services/security.yaml

@@ -4,11 +4,10 @@ services:
         autoconfigure: true
     Chill\DocStoreBundle\Security\Authorization\StoredObjectVoter:
         arguments:
-            $storedObjectVoters:
-                # context specific voters
-                - '@accompanying_course_document_voter'
+            $storedObjectVoters: !tagged_iterator stored_object_voter
         tags:
             - { name: security.voter }
 
-    accompanying_course_document_voter:
-        class: Chill\DocStoreBundle\Security\Authorization\AccompanyingCourseDocumentVoter
+    Chill\DocStoreBundle\Security\Authorization\AccompanyingCourseDocumentVoter:
+        tags:
+            - { name: security.voter }