[PATCH 0/4] MR8304: win32u: Introduce NtUserRegisterWindowMessage syscall implementation.

[Rémi Bernon (＠rbernon)]

To later be properly implemented using winstation atom table.

The idea is to try to share the atom table in shared memory, to avoid round trips when reading window class info. The global atom table lives in ntdll and moving the session shared memory there seems more inconvenient than using atom tables in winstation shared objects, which could stay in win32u.