Delete handlers module

Following the restructuring of the last commits.

briar-gtk/briar_gtk/conversation/conversation_presenter.py

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 # License-Filename: LICENSE.md
 
-from briar_gtk.handlers.notification import NotificationHandler
+from briar_gtk.notification_handler import NotificationHandler
 from briar_gtk.private_chat.private_chat_presenter import PrivateChatPresenter
 from briar_gtk.define import APP
 from briar_gtk.private_chat.private_chat_view import PrivateChatView

briar-gtk/briar_gtk/handlers/__init__.py

-# Copyright (c) 2020 Nico Alt
-# SPDX-License-Identifier: AGPL-3.0-only
-# License-Filename: LICENSE.md
-"""
-Similar to presenters, handlers react to input, but they aren't attached
-to a view
-"""

briar-gtk/briar_gtk/handlers/notification.py → briar-gtk/briar_gtk/notification_handler.py

-# Copyright (c) 2020 Nico Alt
+# Copyright (c) 2020-2021 Nico Alt
 # SPDX-License-Identifier: AGPL-3.0-only
 # License-Filename: LICENSE.md