Sniper rifle training: Fix general camera weirdness
- Camera bounced back and forth between shots
- FollowGear was called every 20ms (way too often)
- Now camera only re-centers when using sniper rifle
- Camera also centers to dynamite once
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
