Gunboat power supply balance

[Muleo]

This might just be my opinion, but I think the Osiris and similar sized ships should keep the same powerplant, and bigger ships should have bigger powerplants.

Reason? To try and encourage the use of the big guns, like the mortars. I don't like the way disco battleships just fire lasers at each other, I'd prefer to see them trading mortar shots, this promotes more movement, makes for a more interesting/exciting fight, rather than 2 beasts just sitting opposite each other and boxing while spamming lasers at each other.