* Figure out what's up with getting/setting gc background/foreground colors and
  how to get RGB values from pixels.
* Provide access to GTK version number.
* See if it's possible or needed to set GtkAdjustment properties (and similar
  ones).
* Add missing field defs to gtk.defs (as necessary).
* Document limitation of not being able to assign color components directly in
  cascaded overloads, i.e. $style->base[GTK_STATE_NORMAL]->red = 55555.

* Implement GdkPoint support.

* Register constants for cursor names.

* Gnome support

* Clean up and optimize generator

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