Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibC/limits.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <stdint.h>
+
+#define PAGE_SIZE 4096
+
+#define PATH_MAX 4096
+
+#define INT_MAX INT32_MAX
+#define INT_MIN INT32_MIN
+
+#define UINT_MAX UINT32_MAX
+#define UINT_MIN UINT32_MIN
+
+#define CHAR_BIT 8
+#define SCHAR_MIN (-128)
+#define SCHAR_MAX 127
+#define UCHAR_MAX 255
+
+#define LONG_MAX 2147483647L
+#define LONG_MIN (-LONG_MAX - 1L)
+
+#define CHAR_MIN SCHAR_MIN
+#define CHAR_MAX SCHAR_MAX
+
+#define MB_LEN_MAX 16