app: Refactor get_all_objects.
Add initial object registry.
app: Support object registry in get_all_objects.
app: Make commandrunner/debugconsole private.
utils: Add helper functions get_object/register_object.
Use object registry for cache/cookiejar.
Use a normal UserDict for ObjectRegistry.
Rename global registry from obj to registry.
Add a meta-registry.
Improve get_all_objects output.
Merge get_all_widgets into get_all_objects.
Add __repr__ for cookies/cache.
Fix lint
Add object registry support to command handler.
Use object registry for rl_bridge.
Use object registry for searchrunner.
Use object registry for stateconfig.
Use object registry for messagebridge.
Remove destroyed QObjects from ObjectRegistry.
Use object registry for app._timers.