Set mode of reading keyboard input.
First arg INTERRUPT non-nil means use input interrupts;
nil means use CBREAK mode.
Second arg FLOW non-nil means use ^S/^Q flow control for output to terminal
(no effect except in CBREAK mode).
Third arg META t means accept 8-bit input (for a Meta key).
META nil means ignore the top bit, on the assumption it is parity.
Otherwise, accept 8-bit input and don't use the top bit for Meta.
Optional fourth arg QUIT if non-nil specifies character to use for quitting.
See also `current-input-mode'.
(fn INTERRUPT FLOW META &optional QUIT)