Fixed lua error with upgraded boxing gloves

"This player has been picked up before!" message for upgraded magneto stick now only shows once in chat rather than in the centre of the screen

Added an upgrade for the Zombie Pumpkin:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3332622562

Hopefully fixed paper/snail plane upgrade not working

- Nerfed rotation gun upgrade to rotate for half the time and deal half damage
- Fixed some guns not having the PaP shoot sound applied for the upgrading player

Added a new upgrade for the UNO Reverse:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2329721936

Fixed upgraded observer sheep not making sounds when it should and fixed lua error on reducing its health to 0

Added an upgrade for the Observer Sheep:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1310924738

Added an upgrade for the Time Manipulator:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1318271171

Added an upgrade for the Rotation Gun:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=639376504