ColourToN() - Convert color string to numeric value
 Converts NN/NN or CC/CC color values into numeric values
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 Syntax

     ColorToN(<cAttr>) --> nAttr

 Argument

     <cAttr> is the colour attribute that is converted from NN/NN or CC/CC
     to it's numeric value.

 Returns

     ColorToN() returns a number that represents the numeric form of the
     color string.

 Description

     ColorToN() changes a colour string attribute from NN/NN or CC/CC to
     it's numeric equivalent

 Notes

     ■  Passing an invalid colour string will result in a return value of 0
        (black on black)

     ■  Passing a valid numeric colour attribute to this function will result
        in a return value of the original numeric form

     ■  This function does not alter the cursor position.

 Examples

     ■  Convert these:

        ? ColorToN("07")          // returns 7
        ? ColorToN("07/00")       // returns 7
        ? ColorToN("W/N")         // returns 7

     ■  red on white:

        ? ColorToN("04/07")       // returns 116
        ? ColorToN("R/W")         // returns 116

     ■  If the foreground colour is missing then 0 is assumed.

        ? ColorToN("/7")

     ■  High intensity (+) and flashing (*) are also recognized:

        ? ColorToN("BR+")
        ? ColorToN("BR+*")
        ? ColorToN("G/BR+*")
        ? ColorToN("+G*/BR")


 Files:  Library is MRWINDOW.LIB.