v1.10: Day night cycle

Feature Day Night Cycle: Now there is day night cycle system, player can config it on the map selection menu.

Free building placement: Except the resource center, other base buildings can be placed freely on the map.

Improved ground vehicle destroyed effect: When the ground vehicles are destroyed, this camouflage will change into rust color, and the heavy vehicles may have a chance to burn for a while before explosion.

New Building Firebase: The dozer can build the firebase which can garrison at most 4 infantries, and it can call the helicopter to carry a missile turret or even howitzer on it.