Backed out changeset 13589d529899
So, we only disabled this on the release branch in r29d614a5c9eb due to having discovered it JUST before release.
We should fix it properly in default...
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