Fixed unable to craft ammo

Updated for change from 5.5 to 2017 LTS

All particle effects have been tweaked
Battleship Shell ID changed from 8796 to 8797
Barricade item added for spawning vehicle (ID: 8796), craftable from Makeshift Vehicle

Reloading audio now matches with the reload timing correctly
Dexterity skill will now help to improve the main turret's reload speed
Burst mode changed from 4 shots per salvo to 2

HMS Iron Duke:
Tweaked material due to weird lighting at night
Driver now doubles as front turret gunner
Stability and handling improved, it should be much easier to steer and harder to get the vehicle stuck
Fuel capacity increased to 8000
Health increased to 17000
9x10 storage added to the vehicle
Fixed issue when the turrets did not change colour after the vehicle explodes
HMG gun angles increased to improve comfort when using the mounts

Reverted back to Unity 5.5 due to recent update

Reuploaded to resolve issue with regards to the ship being invisible

Improved LOD on vehicle, should be more optimised now
Removed Metallic attribute on the Material, seems to be quite intensive on the game performance
Updated buoyancy Box Colliders
Fixed passenger explosion armor, players on board should survive from explosions now
Increased audio volume range of projectiles

First release

HMS Iron Duke: 8796
Battleship Shell: 8796