Panty Raid added to the game

Harry Bal is looking to get as many panties as he can before Halloween. He promised to trade you some good stuff for the panties. Go on Panty Raids and collect as many as you can. Save them up. In the future seasonal events panties will be currency. New ways to collect panties will be added between the seasons.
Don't get caught and make Harry happy.

Added elements:
- Panty Raid
- Trampoline Girl
- Event stage

Smaller Updates
- emission added
- grass clipping adjusted
- sky tweaked
- background adjustments