Consolidate beam and cloud handling routines a bit, and allow clouds to

destroy items on the floor where applicable. Also allow grey smoke as a random potion effect from Evaporate.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5040 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on May 14, 2008
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