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

test/test_api_usage.py

@@ -12,8 +12,8 @@ from playhouse.test_utils import assert_query_count
 from endpoints.api import api_bp, api
 from endpoints.building import PreparedBuild
 from endpoints.webhooks import webhooks
-from endpoints.trigger import BuildTriggerHandler
 from app import app
+from buildtrigger.basehandler import BuildTriggerHandler
 from initdb import setup_database_for_testing, finished_database_for_testing
 from data import database, model
 from data.database import RepositoryActionCount