Move signal handlers into their own app module

mayan/apps/document_states/apps.py

@@ -11,6 +11,7 @@ from common.utils import encapsulate
 from documents.models import Document
 from navigation.api import register_model_list_columns
 
+from .handlers import launch_workflow
 from .models import (
     Workflow, WorkflowInstance, WorkflowInstanceLogEntry, WorkflowState,
     WorkflowTransition
@@ -27,11 +28,6 @@ from .links import (
 )
 
 
-def launch_workflow(sender, instance, created, **kwargs):
-    if created:
-        Workflow.objects.launch_for(instance)
-
-
 class DocumentStatesApp(apps.AppConfig):
     name = 'document_states'
     verbose_name = _('Document states')