Restore capability of lua scripts to change autopickup behaviour so

pickup_butcher_tool.txt can work, changed so that ')' doesn't have to be in the autopickup line for it to work. Also changed so that it's easy for multiple lua functions to change autopickup without stepping on each other.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5690 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 9, 2008
JLCSPMTVGUYTGZNCWPMFITEZZ2CDHL2JF67FFODO5L44OVAW4WWAC
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