* the player data inventory-itemdb index is now refreshed using pc_setinventorydata()
* mobdb will no longer initialize with nonexistent items, and mobs will no longer drop them in case of a reload
* the clif_buylist() function once again hides invalid npc shop items
* it is no longer possible to purchase nonexistent items from a npc shop
* npc shop loading will not abort if there is a nonexistent item entry, it will just skip over it
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12665 54d463be-8e91-2dee-dedb-b68131a5f0ec
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