Make it possible to drop any item from trees #7
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Builds on top of #6 to allowing a tree to drop any item. Note to do this, you must set the drop_id in the tree's ZMB entry to the item id you want to drop OR'd with 0x8000 (i.e. the 16-bit item_id you want with its MSB set).
Unfortunately I had to use assembly for this, as I needed to reuse existing code to do this. However, with the exception of one line, all of the assembly is based on existing routines, so we can treat it more or less as a black box.