Optimized the map's nav mesh.

Fixed a bug that player can jump on the van in the map.
Fixed player being able to walk on a wrong container.
Adjusted the melee weapon's position and added another melee weapon.
Optimized the map's nav mesh.

Added invisible walls around the map, players can't get out off the map now.
Added a sound when pressing the button.
Changed the lighting of the map, now looks darker but better.
Changed the sky of the map to fit the lighting.
Changed some models of the map.
Changed the poster in the loading screen.
Fixed not spawning items on map, you can find more items now.
Fixed player being able to climb on a wrong container.
Deleted the door near the button and now it is easier to go up.
Increased zombie refresh interval, which should make the map a little easier.
Moved the two planks above the spawn point, and now you can jump between the containers.

修复了错误的主页链接。

It's the first version of Shipment Survive.