Make StringMap use a HashMap instead of std::map internally.
Optimize CachedFileStat: make it accept StaticString filenames and do not copy strings when looking up the cache.
Move some files to Utils.
Get rid of StringListCreator, which isn't being used.
Consolidate application type information into a single place.
Make the Apache module use AppTypes.h code too, and remove {Rails,Rack,Wsgi}AutoDetect.