Fix crash when trying to open ammo menu with current team hog gear = nil
Also fixes crash in A Classic Fairytale, mission 2 when rightclicking at Brainiac intro sequence (#142)
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
