Move pickup_butcher_tool.txt into (the recently freed) pickup.lua,

re-enable it (whoops) and clean up its code.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5698 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 10, 2008
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