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Utility functions surrounding terminal devices & I/O.

Much of this code performs platform-sensitive branching, e.g. Windows support.

This is its own module to abstract away what would otherwise be distracting
logic-flow interruptions.
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    Determine current local pseudoterminal dimensions.

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    Suitable for most POSIX platforms.

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    Detect if given stdin ``stream`` seems to be in the foreground of a TTY.

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    stream's file descriptor to see if they match; if they do not match, it is
    likely that the process has been placed in the background.

    This is used as a test to determine whether we should manipulate an active
    stdin so it runs in a character-buffered mode; touching the terminal in
    this way when the process is backgrounded, causes most shells to pause
    execution.

    .. note::
        Processes that aren't attached to a terminal to begin with, will always
        fail this test, as it starts with "do you have a real ``fileno``?".

    .. versionadded:: 1.0
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    Force local terminal ``stream`` be character, not line, buffered.

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    Test ``input_`` to determine whether a read action will succeed.

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    Query stream ``input_`` to see how many bytes may be readable.

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        If we are unable to tell (e.g. if ``input_`` isn't a true file
        descriptor or isn't a valid TTY) we fall back to suggesting reading 1
        byte only.

    :param input: Input stream object (file-like).

    :returns: `int` number of bytes to read.

    .. versionadded:: 1.0
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