Statistics

- Fixed crash in `cPlayer::UpdateMovementStats`
- Fixed typo in `cStatInfo`

New stats:
- achievement.spawnWither
- achievement.killWither
- stat.swimOneCm
- stat.fallOneCm
- stat.flyOneCm
- stat.diveOneCm
- stat.fishCaught
- stat.junkFished
- stat.treasureFished

Refs #1008