Start refactoring of the trigger system:

- Move each trigger handler into its own file
- Add dictionary helper classes for easier reading and writing of dict-based data
- Extract the web hook payload -> internal representation building for each trigger system
- Add tests for this transformation
- Remove support for Github archived-based building

endpoints/webhooks.py

@@ -9,8 +9,9 @@ from auth.permissions import ModifyRepositoryPermission
 from util.invoice import renderInvoiceToHtml
 from util.useremails import send_invoice_email, send_subscription_change, send_payment_failed
 from util.http import abort
-from endpoints.trigger import (BuildTriggerHandler, ValidationRequestException,
-                               SkipRequestException, InvalidPayloadException)
+from buildtrigger.basehandler import BuildTriggerHandler
+from buildtrigger.triggerutil import (ValidationRequestException,  SkipRequestException,
+                                      InvalidPayloadException)
 from endpoints.building import start_build