Add line mode flag

[mtabini]

Hello! In my application, I needed to receive each character from the client individually, and so I implemented a new flag called lineMode (off by default for backwards compatibility). I figured this might be handy for others, so I thought I'd send in a PR for it. Cheers!

[LennartHennigs]

Hey,
Thank you for the PR. Yes, that's a good point. Will test it and merge it.
But I'll rename the set function to be a setLineMode() or enableLineMode(). Something along those lines.

Cheers
L.

[LennartHennigs]

Hey,
pushed code in the latest update. Thank you. Due to conflicts in the current code and due to my lack of github skills I did add the code manually and will close this branch.

Cheers
l.