Combat Overhaul: Naval Capacity

Naval capacity in late game has been drastically reduced. This is in accordance with making ships increase in strength and cost much faster, reducing ship numbers and game lag.

The bonus decreases with pop number can indeed be an issue if one goes extremely wide without teching up enough. But that is WAD. One can go wide, but will have to pay a price if one omits Technology.
 * 1) Spaceports and habitats no longer give naval capacity
 * 2) Population gives the same amount as previously (which is pretty low)
 * 3) To keep approximately the same values in early game as vanilla, a empire modifier that gives up to 300% extra naval capacity is added. The bonus decreases with total number of pops