Lower the price of the Simple Cannon

To an experienced player, 50k for the simplest cannon you can build seems absurd. It's not too difficult to build a fairly similar cannon, if not this exact one by memory/practice, no Litematica needed. Lowering the price of this cannon would make raiding more accessible to new players. It also avoids the frustration of spending 50k on a cannon, only to find out it's in the wrong spot/there is no base there, which is common when trying to find underground bases. This cannon can't raid bases with water/lava walls, at least as-is, so this won't affect any faction with even a moderate level of experience. The only concern is that I think raiding should be balanced first (i.e. addressing the issue of cores being WAAY too easy to find) MORE INFO BELOW