[skinlf-dev] Button text color

Hi,

 Currently it is impossible to change the color of text in a button.This
is very unfortunate, because if someone try to use both dark and bright
themes, then they forced to change the color from their program
manually. I think the correct, and backward compatible way to implement
this feature, is the extending the GtkButton class with an optional
textColor argument, and when the installUI method get called, it will
set the foreground color, if the textColor argument is not null.
 Is there any objection with it, or can I go ahead and implement this
functionality? 

BR
 Zsombor