Added window classes in the server, and support for inter-process
GetClassWord/Long (based on a patch by Mike McCormack).
Various fixes to the class instance handling.

diff --git a/server/request.h b/server/request.h
index a0287ad..ec2d5a1 100644
--- a/server/request.h
+++ b/server/request.h
@@ -279,6 +279,9 @@
 DECL_HANDLER(start_hook_chain);
 DECL_HANDLER(finish_hook_chain);
 DECL_HANDLER(get_next_hook);
+DECL_HANDLER(create_class);
+DECL_HANDLER(destroy_class);
+DECL_HANDLER(set_class_info);
 DECL_HANDLER(set_clipboard_info);
 DECL_HANDLER(open_token);
 DECL_HANDLER(set_global_windows);
@@ -464,6 +467,9 @@
     (req_handler)req_start_hook_chain,
     (req_handler)req_finish_hook_chain,
     (req_handler)req_get_next_hook,
+    (req_handler)req_create_class,
+    (req_handler)req_destroy_class,
+    (req_handler)req_set_class_info,
     (req_handler)req_set_clipboard_info,
     (req_handler)req_open_token,
     (req_handler)req_set_global_windows,