Fix zed stuck at water tunnel.

Adjusted some ambient.

2019/11/25 Changelog:

1. Renew all lightmap of mesh entirely.
2. New ammo crate looking.

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3. Adjust ammo crate's respawn delay :

A - In endless mode, delay will increase every wave.
B - If your server has more than 7 players, ammo crate's delay will change.
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Texture update + Zed spawn rate decreases.