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/stdbool.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#ifndef __cplusplus
+
+#    include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#    define bool _Bool
+#    define true 1
+#    define false 0
+#    define __bool_true_false_are_Defined 1
+
+__END_DECLS
+
+#endif