Don't crash on loading a game.
Distinguish between wizard/priest/innate spells on xv screen.

I imagine this won't work quite right if ever we get a monster who has
multiple spell sets with multiple types, but I don't think we have such
an enemy at present (if we consolidate abilities into spell sets this
may be a more pressing problem though).

Possibly this could also be added to the Lua functionality if it is
useful.