Fixed greedy mode explore_stop so that "items" stops when non-autopickup

items come into view and "greedy_items" stops when autopickup items come into view.

Also added the new explore_stop conditions "glowing_items", "artefacts" and "runes", which stops greedy explore when non-autopickup items which are glowing/rune/etc, artefacts and runes (respectively) come into view.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5352 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 30, 2008
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