Make weapon noises more interesting (FR 1748813).

Noisy weapons are now incredibly chatty and like to imitate dungeon noises, except the Singing Sword which usually sings and sometimes feels chatty. The underlying prob of making noises is unchanged.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2084 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 14, 2007
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