Add an Xcode project capable of building Crawl, with build configurations

equivalent to the normal, debug, and wizard makefile targets as well as a Universal-build optimized Release target.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@11 c06c8d41-db1a-0410-9941-cceddc491573

Created by  nlanza  on August 12, 2006
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