Mitigate PboDLL limitation

this mitigates a newly introduced/reduced limitation on config size/entries when rapying content with Mikero's PBO tools. This issue will unfortunately not be fixed, hence moving keys to Epoch_B

SQF/dayz_epoch_b/config.cpp

@@ -7,3 +7,8 @@ class CfgPatches {
 		requiredAddons[] = {"dayz_code"};
 	};
 };
+class CfgWeapons
+{
+	class ItemCore;
+	#include "ItemKeys.hpp"
+};