Have menu items drawn with same colors in all platforms (#969)

Also, remove this text from the doc of Fl_Menu_::down_box()
    "If this is FL_NO_BOX then it acts like
    FL_THIN_UP_BOX and selection_color() acts like
    FL_WHITE, for back compatibility."
that was true only for the Windows platform and that required
selection_color to be replaced by white for menu items which is
not what FLTK 1.4 expects.

The new state of menu item drawings is as follows :
- all platforms draw menu items with the same symbolic colors
- selected items and menu titles are drawn with the selection color
as background color
- menu items are drawn by default with no box but can be given one
by Fl_Menu_::down_box(Fl_Boxtype)
- the text of selected items is drawn with the menu's color
unless fl_contrast() finds it does not make enough contrast with
the background (selection color) and substitutes it with a more
adapted color
- the Windows platform uses a visibly different hue for its default
selection color from what other platforms use

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