Get the list of items from the game files

[regner]

Often times we will get an "item ID" from the network packets. This is different from the string ID that we are used to and is an int that corresponds to the index of the item in the items.xml file.

As this could change based on the client version the goal is to be able to convert this into the more standard string ID we are used to. To do that we need to decrypt, decompress, and load the items.xml file from the bin files.

@hmadison has made good progress on this front: https://gist.github.com/hmadison/e00b0022f700597b7800ac31f6fb4c55