Added a basic framework for data exporters

src/pretix/base/__init__.py

@@ -5,4 +5,8 @@ class PretixBaseConfig(AppConfig):
     name = 'pretix.base'
     label = 'pretixbase'
 
+    def ready(self):
+        from . import exporter  # NOQA
+        from . import payment  # NOQA
+
 default_app_config = 'pretix.base.PretixBaseConfig'