Transfer component

res/ui/community_view.ui

src/sakia/gui/certification/controller.py

src/sakia/gui/main_window/controller.py

src/sakia/gui/navigation/navigation.ui

src/sakia/gui/navigation/view.py

src/sakia/gui/toolbar/controller.py

src/sakia/gui/transfer/__init__.py

src/sakia/gui/transfer/controller.py

src/sakia/gui/transfer/model.py

src/sakia/gui/transfer/transfer.py

src/sakia/gui/transfer/transfer.ui

src/sakia/gui/transfer/view.py

src/sakia/gui/widgets/context_menu.py