CleverRaven/Cataclysm-DDA — pull request #9908 by kevingranade (2014-11-08 19:49:29+00:00)
Title: Tiles speedup

Some misc performance work on tiles handling. The main thing is swapping out the std::map that maps tile ids to tile objects for an std::unordered_map.
A much more minor change is reworking the seasonal tile code to not needlessly call itself every time it finds a match for a seasonal tile.