[Tiles] Keep track of which dungeon grid the player last clicked and

don't display the grid description (feature, item, monster) for that grid. Fixes (part of) 2660578, i.e. monster descriptions hiding fighting messages.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9330 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 4, 2009
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