Bugfixes & General improvements

1. fix mesh variation of vxscene drops + adding new crawler and naked drop + fix landscape and rocks
   
2. fix unpickable mossberg bug
   
3. Fix document with directions for manor house
   
4. assets optimizations after sewers exit
   
5. collision fixes after shotgun collect
   
6. fix visor use while on ladder breaking bug
   
7. dog ragdoll animation death fix
   
8. close inventory with esc or p