Behold Battle 0.3a: New game mode

Behold Battle 0.3a: - Added a new game mode: Winner vs random. The winning army continues vs a random army. The more rounds the same army wins, the stronger the enemy army will become. - Added visual effect and sound when you lose a life. - Added victory music, celebrate button and better visual effects when winning. - Changed default slow down/speed up hotkey to QW, so it isn’t the same as zoom in/zoom out (ZX).