xBase Windows colors management
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  Windows greatly enhances the drawing and painting capabilities of our
  applications as it takes great advantage of working in a graphical
  environment.

  Graphical environments offer many more colors to use: normally we will
  be using 16 colors or 256 colors. But we may use millions of colors
  ( depending on which mode we configure Windows to work in ). Note that
  if you select more colors to use, Windows will work slower as it has
  to manage more memory just to perform the same normal processes.

  Also, we are going to use text and pictures ( Bitmaps ), different fonts,
  brushes, etc. at the same time.

  Standard xBase language is being extended to cover all these new graphical
  environment features:

       ... COLOR <cXBASEColor>            // Standard MsDos xBase color format

       ... COLOR <nRGBFore>, <nRGBBack>   // Enhanced RGB colors management

       ... BRUSH <oBrush>                 // Brushes management


  With colors, the main difference with respect MsDos is that we are going
  to use RGB color formats. The RGB format is based on a LONG number ( four
  bytes ) which lets us represent millions of different colors:

                                 Four Bytes

         0                 BLUE              GREEN              RED

   X X X X X X X X    X X X X X X X X   X X X X X X X X   X X X X X X X X
   31           24   23            16  15             8   7             0

                                 Bits order

   We provide the #translate RGB() ( see Colors.ch ) to automatically
   generate RGB values:

  #translate RGB( <nRed>, <nGreen>, <nBlue> ) => ;
                ( <nRed> + ( <nGreen> * 256 ) + ( <nBlue> * 65536 ) )

  Also, FiveWin provides the function nRGB() which uses the same parameters
  and it may be called from inside your applications even at Run Time.

  Another very important new feature is the use of Brushes. Brushes are
  graphical Objects which automatically fill the surface of another
  Object.

  We may build Brushes from standard pure colors -which FiveWin performs
  automatically in the constructor method when we build an Object- or
  patterns based on Bitmaps.

  FiveWin easily lets us keep using the already familiar xBase color
  string format, or, to take advantage of the use of RGB colors and
  Brush Objects.

  FiveWin uses by default the System colors already defined. In Windows
  to change the system colors we don't use SET COLOR TO ..., but instead
  we have to go to the Control Panel and change from there all the colors
  of the system.