Color handling implemented in GSGState

[Adam Fedor]

I implemented color handling in GSGState, so now subclasses don't need 
to do this. If a subclass wants to be notified of a color change, it can 
implement -setColor:(device_colort_t)color state: (color_state_t)state, 
where state can be COLOR_FILL, COLOR_STROKE, or 
COLOR_BOTH=(COLOR_FILL|COLOR_STROKE) - since I've split the colors into 
two, one used for stroking and one for filling.

Since the colors aren't guarenteed to be in rgb format, you might do this:

-setColor:(device_colort_t)color state: (color_state_t)cState
{
  [super setColor: color state: cState];
  fillColor = gsColorToRGB(fillColor);
  strokeColor = gsColorToRGB(strokeColor);
}

Other than that, you can just use the colors, where (if in rgb format)

red = fillColor.field[0]
green = fillColor.field[1]
blue = fillColor.field[2]
alpha = fillColor.field[AINDEX]


I also implemented some of the other font/text methods. Now there is a 
separate ctm for text, which must be concatenated with the regular ctm 
to get the full ctm for text. Don't feel compeled to implement this 
right away as there is nothing in the frontend that uses it yet.

I updated xlib and winlib to use the new color scheme.


--
Adam Fedor, Digital Optics Corp.      | I'm glad I hate spinach, because
http://www.doc.com                    | if I didn't, I'd eat it, and you
                                      | know how I hate the stuff.