Add %player_item_in_SLOT_name%

[HappierGore]

I can't pull request, but I think that this placeholder could be very usefull for everyone, just that, add:
%player_item_in_SLOT_name% (and variants.)
where slot, could be helmet, chest, leggs, feed, hand, offhand

[Starmism]

Use the CheckItem expansion :)