create contextmanager and refactor docgeneratorTemplateType

src/Bundle/ChillDocGeneratorBundle/config/services.yaml

@@ -20,3 +20,12 @@ services:
         resource: "../Controller"
         autowire: true
         autoconfigure: true
+
+    Chill\DocGeneratorBundle\Form\:
+        resource: "../Form/"
+        autowire: true
+        autoconfigure: true
+
+    Chill\DocGeneratorBundle\Context\ContextManager:
+        arguments:
+            $contexts: !tagged_iterator { tag: chill_docgen.context, default_index_method: getKey }