Updated headers and function document from 4.x

artifacts/scripting/headers/command_extra.h

@@ -0,0 +1,8 @@
+#ifndef COMMAND_EXTRA_H
+#define COMMAND_EXTRA_H
+
+#define ammo_caliber(ammoPid)       get_proto_data(ammoPid, PROTO_AM_CALIBER)
+#define obj_name_safe(obj)          (obj_name(obj) if obj else "(null)")
+#define get_active_weapon(critter)  critter_inven_obj(critter, (2 - active_hand) if critter == dude_obj else INVEN_TYPE_RIGHT_HAND)
+
+#endif