Deadshot Demo Patch 2

Changelog:
- Fixed player not being able to uncrouch
- Increased the range of explosions
- Enemies that wake up via range now also check if the player is in sight
- Added more pickups to the 2nd and 3rd level
- Made the 2 fuse slots in the 2nd level more obvious
- Slightly increased shotgun damage
- Fixed an issue where doors powered by the core would be closed when loading the game
- Other small fixes and improvements