Fix sinegun dealing 1 damage when shooting straight up. Reduces sine gun knockback strength by 1.25%
This was caused by AmmoShove, which had a strenght which was *right* above the threshold for fall damage.
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