Merge branch 'xx-3678/ftChaCha20' into 'dev'

fileTransfer/manager_test.go

fileTransfer/receive.go

fileTransfer/receiveNew_test.go

fileTransfer/send.go

fileTransfer/send_test.go

keyExchange/confirm.go

storage/fileTransfer/fileMessage.go

storage/fileTransfer/fileMessage_test.go

storage/fileTransfer/partStore_test.go

storage/fileTransfer/receiveFileTransfers.go

storage/fileTransfer/receiveFileTransfers_test.go

storage/fileTransfer/receiveTransfer.go

storage/fileTransfer/receiveTransfer_test.go

storage/fileTransfer/sentTransfer.go

storage/fileTransfer/sentTransfer_test.go