[SDK] Reorganize header files

SDK/INC/CRT/wchar.h

@@ -0,0 +1,38 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   wchar.h
+
+Abstract:
+
+   Provides definitions for wide string routines.
+
+--*/
+
+#pragma once
+
+#ifndef _WCHAR_H
+#define _WCHAR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <string.h>
+
+size_t wcslen(const wchar_t *str);
+size_t wcsnlen(const wchar_t *str, size_t maxlen);
+
+wchar_t *wmemset(wchar_t *dest, wchar_t c, size_t count);
+wchar_t *wmemcpy(wchar_t *dest, const wchar_t *src, size_t count);
+wchar_t *wmemmove(wchar_t *dest, const wchar_t *src, size_t count);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_WCHAR_H */