Xcode: enable SQLite in Xcode builds, fix preprocessor macros

 - SQLite wasn't enabled in Xcode, but it worked fine for
   builds with makefile.unix. Now it's enabled and it works
   fantastically.

 - The preprocessor macros for each of the configurations for
   the Crawl Tiles target were wrong. Now set to inherit from
   project properties instead, adding only USE_TILE and
   CLUA_BINDINGS for all targets.

 - Optimization is enabled in the Development configuration
   now, as I figure most development will be done only on the
   native machine architecture, but optimization will be fine
   unless there's a bizarre bug that requires a complete lack
   of optimizations (which is what the Debug build is really
   for anyway).

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

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