added a atk power return value when you search for key cubes. and fixed multiple little logical bugs in AIUtils. But it is going to be changed again, since actually we can't just only know one key cube. we have to have multiple choices so that we can have finer control of the attack power of the AI
there are really a lot of logical bugs in SimpleMap / AI related things. This is why I can't get a accurate key cube power reading all along
removed damage_factor. I probably won't be used ever again. and adjusted the time delay between chain actually pushed garbages and the opponent's garbage stock actually get it