Tidy up tiles some more.

Add subfolders for some armour types, demonic monsters, and reinstate some of the unused tiles that conceivably could see use in the future (e.g. for new unrandarts or for meta-commands) in an UNUSED folder.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8006 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on December 28, 2008
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