Hotfix for bugged hitpoint defence save/load
Updated for SIF 1.4 item size change

This update makes the SIF API changes related to item sizes. There are
now no small/medium/large items, now there's a proper slot-usage style
sizing system so additional checks for moving items to inventories and
containers have been removed and replaced with simpler checks.

DefineItemType calls updated to match the new parameters for sizing and
the carry animation. The original item size definitions have been
redefined in Init.pwn temporarily until fully thought out sizes for each
item type are written in.