Add the field CLASS to the metatable of each class, containing the name of the

class, so that table_to_string() can describe the class of each object.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8840 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 28, 2009
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