ClearSlow()  clears a screen area with delay from the outside in
 Special FX for screens
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 Syntax

     ClearSlow( <nDelay>, [<nTop>], [<nLeft>], [<nBottom>], [<nRight>],
        [<cChar | nChar>] ) --> cNull

 Arguments

     <nDelay> is the delay used for each step in the clear procedure.

     <nTop> is the coordinate for the top screen row. Default is the top line
     of the current window.

     <nLeft> is the coordinate for the left column. Default is left column of
     current window.

     <nBottom> is the coordinate of the bottom row. Default is the bottom row
     of the current window.

     <nRight> is the coordinate of the right column. Default is the right
     column of the current window.

     <cChar | nChar> is the charcater to use to clear the area of screen
     with. The default character is CLEARB.

 Returns

     ClearSlow() always returns a null string, or "".

 Description

     ClearSlow() may be used by you to give your screen clear routines some
     special fx when they clear.

     This function will clear an area of the screen from the outside of the
     area inwards using a delay bewteen each step of the delay.

 Examples

     ■  Use CLEARB to clear the current window with a 80-millisecond delay:

        ClearSlow(80)

     ■  Clear an area with spaces and use a 20-millisecond delay:

        ClearSlow(20, 2, 2, MaxRow()-2, MaxCol()-2, 32)