Disable input stream pumping

[gnodet]

Related to #138, it may be desirable to have a configuration flag on the TerminalBuilder to indicate that the terminal should not try to read the input stream in advance for signal processing.
This would effectively make signal processing less effective, for example a Ctrl+C would only be detected when the actual character would be read by the application instead of when the user hits the key. A better approach would be #140, but is much more complicated to implement.

[gnodet]

Working on #140 instead.