Beta 0.83: Gepard, WS-1 and water effect

Beta 0.83 New Units: Gepard: A firesupport unit that can attack both ground and air units. Its gatting gun has more accuracy than other gatting guns. WS-1: MLRS that can fire 12 rockets at the same time. It has more damage and attack range than BM-21, but is also more expensive.

Features: Water: There are water pools in the map, not just a decorate but can slow down ground units moving on. So players should keep attention water pools on the map and make use of them. Light: Adjust lighting effects on the map, the game looks much more bright now.

Balance: Most vehicles add move speed, game pace is much more fast now.

Bug Fix: