Standardize Frozzes

Frozzes now always add 150 offense (even to weapons, although the nature
of weapons means you could only use one Froz and no shield).

Frozzes now always add 3-5 damage if you have the mana.

Throwaway tofers don't really seem to be a concern anymore. No need to
hamstring JoFs for most of a mage's building life.