WIP Use Flows for Sources and Providers (#32)

* core: start migrating to flows for authorisation

* sources/oauth: start type-hinting

* core: create default user

* core: only show user delete button if an unenrollment flow exists

* flows: Correctly check initial policies on flow with context

* policies: add more verbosity to engine

* sources/oauth: migrate to flows

* sources/oauth: fix typing errors

* flows: add more tests

* sources/oauth: start implementing unittests

* sources/ldap: add option to disable user sync, move connection init to model

* sources/ldap: re-add default PropertyMappings

* providers/saml: re-add default PropertyMappings

* admin: fix missing stage count

* stages/identification: fix sources not being shown

* crypto: fix being unable to save with private key

* crypto: re-add default self-signed keypair

* policies: rewrite cache_key to prevent wrong cache

* sources/saml: migrate to flows for auth and enrollment

* stages/consent: add new stage

* admin: fix PropertyMapping widget not rendering properly

* core: provider.authorization_flow is mandatory

* flows: add support for "autosubmit" attribute on form

* flows: add InMemoryStage for dynamic stages

* flows: optionally allow empty flows from FlowPlanner

* providers/saml: update to authorization_flow

* sources/*: fix flow executor URL

* flows: fix pylint error

* flows: wrap responses in JSON object to easily handle redirects

* flow: dont cache plan's context

* providers/oauth: rewrite OAuth2 Provider to use flows

* providers/*: update docstrings of models

* core: fix forms not passing help_text through safe

* flows: fix HttpResponses not being converted to JSON

* providers/oidc: rewrite to use flows

* flows: fix linting

passbook/providers/oidc/apps.py

@@ -1,6 +1,4 @@
 """passbook auth oidc provider app config"""
-from importlib import import_module
-
 from django.apps import AppConfig
 from django.db.utils import InternalError, OperationalError, ProgrammingError
 from django.urls import include, path
@@ -15,6 +13,7 @@ class PassbookProviderOIDCConfig(AppConfig):
     name = "passbook.providers.oidc"
     label = "passbook_providers_oidc"
     verbose_name = "passbook Providers.OIDC"
+    mountpoint = "application/oidc/"
 
     def ready(self):
         try:
@@ -36,5 +35,3 @@ class PassbookProviderOIDCConfig(AppConfig):
                 include("oidc_provider.urls", namespace="oidc_provider"),
             ),
         )
-
-        import_module("passbook.providers.oidc.signals")