Added new VMIN/VTIME API for TTYPort #289
                
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I still need to test this with some actual hardware (it might not work at all, I am still new to nix/termios etc. with Rust :)) but this possibly fixes #272 and #277 .
set_vmin_timemethod to configure VMIN and VTIME termios parametersset_non_blockingmethod to set VMIN and VTIME to 0