added foreground colored stroke/pen support #153
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When the alpha of a stroke is -INFINITY, it'll render the stroke with the foreground color from the GtkStyleContext.
The black (0.0, 0.0, 0.0, 1.0) default pen color has been replaced with a new button that is able to select that particular "color". If a user has modified his toolbar colors, he'll have to drop/change that color manually.