Changed gamemodeinfo_t::teleFogType from a deh num to a thingtype name.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2676 86ba831e-150c-0410-ab35-e06eaae15ed9
Move base/user/game path determination and iteration functions to d_files.cpp

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2677 86ba831e-150c-0410-ab35-e06eaae15ed9