[REACTOS] Standardize <imm.h> and <immdev.h> (#6493)

Improve header compatibility and
code quality.
JIRA issue: CORE-19268
- Improve <imm.h> and <immdev.h>
  compatibility by correctly choosing
  the items.
- Use <immdev.h> instead of
  <ddk/immdev.h>.
- Move INPUTCONTEXTDX, IMEINFOEX,
  IMEDPI, and CLIENTIMC into
  <imm32_undoc.h>.
- Adapt to these changes.

dll/win32/msctf/utils.cpp

@@ -16,7 +16,6 @@
 #include <windows.h>
 #include <sddl.h>
 #include <imm.h>
-#include <ddk/immdev.h>
 #include <cguid.h>
 #include <tchar.h>
 #include <msctf.h>