Add 50 placeholder items for server admins to use

Server admins can add new items by re-naming the new placeholder items. E.g.: Placeholder_01_kit can be re-named by overwriting the string within the missionfile. This is for example useful to bind arma buildable to an actual in-game item which can be crafted or looted.

SQF/dayz_code/Configs/CfgMagazines/CfgMagazines.hpp

@@ -68,4 +68,5 @@ class CfgMagazines
 	#include "Buildings\Misc.hpp"
 	#include "Buildings\StaticWeapons.hpp"
 	#include "Buildings\Plants.hpp"
+	#include "Buildings\Placeholders.hpp"
 };