Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/sys/thing.h b/sys/thing.h
new file mode 100644
index 0000000..e478014
--- /dev/null
+++ b/sys/thing.h
@@ -0,0 +1,19 @@
+// MorgenGrauen MUDlib
+//
+// thing.h -- standard thing definitions
+//
+// $Id: thing.h,v 3.5 2004/05/20 19:00:12 Vanion Exp $
+
+#ifndef __THING_H__
+#define __THING_H__
+
+#include "/sys/thing/commands.h"
+#include "/sys/thing/description.h"
+#include "/sys/thing/language.h"
+#include "/sys/thing/properties.h"
+#include "/sys/thing/moving.h"
+#include "/sys/thing/restrictions.h"
+#include "/sys/thing/material.h"
+#include "/sys/thing/lighttypes.h"
+
+#endif