Creation of the common module and notification system

Created a new Django App to centralize the generic functions of Watcher used by multiple modules.
Refactored the notification system to integrate SMTPS protocol (replacing SMTP).
Added automatic alert creation in TheHive via Feeder.
Integrated notifications through the Citadel enterprise application (via APIs).
Added Slack notifications (via APIs).

.env

@@ -38,7 +38,7 @@ EMAIL_CLASSIFICATION=INTERNAL
 # THE HIVE Setup
 THE_HIVE_URL=
 THE_HIVE_VERIFY_SSL=False
-THE_HIVE_API_KEY=
+THEHIVE_API_KEY=
 THE_HIVE_CASE_ASSIGNEE=watcher
 THE_HIVE_TAGS=Watcher,Impersonation,Malicious Domain,Typosquatting
 THE_HIVE_CUSTOM_FIELD=watcher-id

Watcher/Watcher/watcher/settings.py

@@ -116,7 +116,7 @@
     THE_HIVE_VERIFY_SSL = True
 if THE_HIVE_VERIFY_SSL == "False":
     THE_HIVE_VERIFY_SSL = False
-THE_HIVE_API_KEY = os.environ.get('THE_HIVE_API_KEY', '')
+THEHIVE_API_KEY = os.environ.get('THEHIVE_API_KEY', '')
 THE_HIVE_CASE_ASSIGNEE = os.environ.get('THE_HIVE_CASE_ASSIGNEE', 'watcher')
 THE_HIVE_TAGS = os.environ.get('THE_HIVE_TAGS', "Watcher,Impersonation,Malicious Domain,Typosquatting").split(",")
 THE_HIVE_CUSTOM_FIELD = os.environ.get('THE_HIVE_CUSTOM_FIELD', 'watcher-id')