[VV] Ship design

Waking up the Vectorverse concept...

I think we ought to have a range of sizes within a class, but I think we
ought also to have dtinct classes.  Just as a for-instance, destroyers
are
mass 20-40, cruisers mass 80-150, battleships mass 300-600.

I think smaller ships ought to be more maneuverable (and probably a bit
faster?) than larger ships, although I think that DD=MD6 / CA=MD4 /
BB=MD2 is probably too much of a spread.