[SDK] Reorganize header files

SDK/INC/CRT/string.h

@@ -0,0 +1,38 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   string.h
+
+Abstract:
+
+   Provides definitions for string routines.
+
+--*/
+
+#pragma once
+
+#ifndef _STRING_H
+#define _STRING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+size_t strlen(const char *str);
+size_t strnlen(const char *str, size_t maxlen);
+
+void *memset(void *dest, int c, size_t count);
+void *memcpy(void *dest, const void *src, size_t count);
+void *memmove(void *dest, const void *src, size_t count);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_STRING_H */