gel.window: Add support for a Gtk window.

4-high/gel/applet/demo/game/pong-gtk/pong.gpr

@@ -0,0 +1,18 @@
+with 
+     "gel_gtk",
+     "lace_shared";
+
+
+project Pong
+is
+   for Object_Dir use "build";
+   for Exec_Dir   use ".";
+   for Main       use ("launch_pong.adb");
+   for Languages  use ("Ada");
+
+   package Ide      renames Lace_shared.Ide;
+   package Builder  renames Lace_shared.Builder;
+   package Compiler renames Lace_shared.Compiler;
+   package Binder   renames Lace_shared.Binder;
+
+end Pong;