Fix 1937869: Have weapon swapping respect spells the character knows

         and allow wielding the appropriate items, e.g. arrows for
     Sticks to Snakes etc.
     Use the same rules for clicking on items in Tiles.

Also add yet another minimap colour option, this time for plants (really zero xp monsters in general) since I became tired of plant-rich vaults showing up in bright red colours.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4195 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 11, 2008
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