Remove rubber duck from BRW, RW and most weapon schemes for now
The duck is not liked by players.
Rubber duck needs a lot of rework. Before that happens, better remove it from
game modes for now. Players can always modify the weapon schemes, of course.
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
