======Synopsis:======
__input_char__ [-noecho] "<prompt>" {<stuff>}

======Description:======
This command prompts the user to type ONE character and then runs the 
<stuff> and $* will be the user's response.

The -noecho option will suppress the outputting of the character to the
input line as it is typed.

The $'...' expando is a wrapper around __INPUT_CHAR__ in case you were
wondering.  It's always better to use __INPUT_CHAR__ than $'...' if you
can arrange it because it operates asynchronously, which means it plays
nicely with other commands.

======Examples:======
      input_char "Press 'q' to quit, any other key to continue: " {
         unless ( [$0] == [q] ) {
            /* do whatever */
         }
      }

======History:======
The __INPUT_CHAR__ command first appeared in EPIC3.003.