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.
07f3bf8d98a3
Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang
