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.