Restructure the library layers

src/os/wapp_os.h

@@ -0,0 +1,22 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef WAPP_CORE_H
+#define WAPP_CORE_H
+
+#include "file/file.h"
+#include "shell/termcolour/termcolour.h"
+#include "shell/termcolour/terminal_colours.h"
+#include "shell/commander/commander.h"
+#include "shell/commander/commander_output.h"
+#include "shell/utils/shell_utils.h"
+#include "cpath/cpath.h"
+#include "allocators/arena/mem_arena.h"
+#include "allocators/arena/mem_arena_allocator.h"
+#include "mem/posix/mem_os_posix.h"
+#include "mem/win/mem_os_win.h"
+#include "mem/mem_os_ops.h"
+#include "mem/mem_os.h"
+#include "../common/wapp_common.h"
+#include "../base/wapp_base.h"
+
+#endif // !WAPP_CORE_H