Remove multi-byte support in the `lines` package
The lines package takes some input, and splits it on a delimiter, and sends the output as defined by a Sender()
. There's currently support for multi byte delimiters, which is both unused, and broken.
Broken because for example using twice the same byte as delimiter will not send any results. There's currently no call site using this feature, nor test coverage for it. Therefor we should remove it.