XX-3630 / Add message indicating file transfer is complete

api/authenticatedChannel.go

api/client.go

auth/callback.go

auth/confirm.go

bindings/fileTransfer.go

bindings/notifications.go

cmd/fileTransfer.go

fileTransfer/ftMessages.pb.go

fileTransfer/ftMessages.proto

fileTransfer/manager.go

fileTransfer/manager_test.go

fileTransfer/oldTransferRecovery.go

fileTransfer/oldTransferRecovery_test.go

fileTransfer/receiveNew_test.go

fileTransfer/receive_test.go

fileTransfer/send.go

fileTransfer/sendNew.go

fileTransfer/sendNew_test.go

fileTransfer/send_test.go

fileTransfer/utils_test.go