UnderAttack: Tower build change to real time build. 塔建造改为实时建造

Tower build change to real time build. 塔建造改为实时建造。 Hot key "B" call build content. Hot key "C" call build turret. Hot key "F" call build anti-air. Hot key "G" call build bunker. Hot key "H" call buiuld barracks.