Revert the change on ammo handling for Tiles, and replace it with a more

generic logic that uses item tiles for BEAM_MISSILE, else bolts according to flavour. Identify monster fired ammunition ego if the launcher ego is known, not that it has much of an effect because plain ammo gets no special description. In the message list the fired item as it will look to the player (i.e. "arrow of ice" for a plain arrow fired off a bow of frost), even though the item actually dropped will still be a plain one. I hope this isn't too confusing. (And if it is, it should be easy to revert. :p)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6331 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 2, 2008
AIVXE6QBRVCZAASKQRZO6LBDGTYEYSSD2DZCWRX4VLSKE3GCNIDAC
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