fix the bug from vrevious version

an unknown bug about material locations in dark carnival's finale
-> cant fix it
-> move laser_aim function to run before relocate function so atleast its playable

- fix error when trying to obtain material while backpack is full

- fix the problem when start a map with no prop_physics inside -> place materials inside the safe area

- add crosshair for 3rd-person mode

- add shotgun firing sound in 3rd-person mode

- Fix misspelling (Alchohol -> Alcohol)

- Fix addon vpk's descriptions
- lower CI number, lower CI damage (to 2 for Easy)
- lower tank health
- now need to CROUCH and SHOVE to search for items
- automatically bind B key to toggle backpack after Craft system is ready.