Overload MF_KNOWN_MIMIC to also mean "a shapeshifter the player has seen

shift", append "shaped shifter" to the end of the name of known shifters, and give a special death message when a non-known shifter dies to let the player know it was a shifter.

Immediately polymorph shifters as soon as they are placed (with no messages to the player) so that if the player enters a new level with a shifter in LOS (or if a shifter is summoned in LOS) the player will never see it as a plain/raw shifter.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8693 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 22, 2009
W4YW6B4WTSMU4E5TXG27A6C2ZH3WASWOKCEMVHP7KEF2CZDLADJAC
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