Open up /events to anonymous users for room events only

synapse/handlers/_base.py

synapse/handlers/events.py

synapse/handlers/message.py

synapse/handlers/presence.py

synapse/handlers/private_user_data.py

synapse/handlers/receipts.py

synapse/handlers/room.py

synapse/handlers/sync.py

synapse/handlers/typing.py

synapse/notifier.py

synapse/rest/client/v1/events.py

synapse/rest/client/v1/room.py

synapse/storage/events.py

synapse/storage/room.py

synapse/storage/schema/delta/25/history_visibility.sql

synapse/storage/stream.py

tests/handlers/test_presence.py

tests/handlers/test_typing.py

tests/rest/client/v1/test_presence.py

tests/rest/client/v1/test_typing.py