Decouple monsters' item pickup ability from their eating ability, and

properly generalize the checks for item-eating monsters.

Currently, monsters' eating abilities are restricted to items (jelly types) and corpses (necrophagi, ghouls, and hungry ghosts; the last can eat corpses in some legends). It should probably be extended to harpies at some point, too.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10628 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 7, 2009
PC6K5OQF3BWPMWTIN5JXAKHTZF453JQOELDWRUOSBZXR256FTUYQC
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