- Rewrite configure test to use gtk_major/minor/micro_version
   directly from the lib instead of looking at gtk+-2.0.pc

 - Remove all fprintf from the code and instead figure out other ways
   to signal the warnings to the application developer.

 - Cast GdkColor members to guint16.

 - Verify that all get_all_args calls uses best integer type, or at
   least big enough integers.

 - Add functionality to generate strings on module load. Should be
   accessible directly from the code, e.g.

   if( str == $STRING("color") )

 - Add multiple pike prototype support where the types are simply
   or:ed. E.g.

   void set_color(object color)
   void set_color(int r, int g, int b)

   instead of

   void set_color(object|int color_or_r, int|void g, int|void b)

 - Ensure all arguments are pop:ed from create methods. (?)