Tweak trophyrace to work better w/ skip (probably, needs testing), drop Invulnerable in favour of effects - heInvulnerable is already in effects, might as well use it. And we weren't making any other gears invulnerable anyway.

foreach(dir "Fonts" "Forts" "Graphics" "Locale" "Maps" "Music" "Sounds" "Themes" "Missions" "Names" "misc" "Scripts")
  add_subdirectory(${dir})
endforeach(dir)