Undefine DATA_DIR, we now have a powerful pResource_Manager
Remove DATA_DIR references from level.cpp
Remove DATA_DIR from audio.cpp
Remove DATA_DIR from savegame.{h,cpp}
Remove DATA_DIR from level_player.cpp
Fix music resource usage in level.cpp
Convert more paths from std::string to boost::filesystem::path
FreeImage doesn’t have a pkg-config file, whyever
Fix some calls to Level::Get_Music_Filename()
Remove DATA_DIR from editor.cpp
Remove DATA_DIR from i18n.cpp
Remove DATA_DIR from the editors
Remove DATA_DIR from scripting.cpp
Remove DATA_DIR from static.cpp
Remove DATA_DIR from the main game menu cpps
Remove DATA_DIR from video.cpp
Remove DATA_DIR from animation.cpp
Remove DATA_DIR from game_core.cpp
Remove DATA_DIR from gl_surface.cpp
Fix 'Could not find sound file' shown for all sounds