More on clearing pickup_types so that autopickup reverts to picking up
evertyhing: for menustyle:Full and Partial, add a menu entry for 'all
classes' as an alternative to unselecting every class already set.
Also, Full and Partial had no way to include venom. Now it's a choice
when in wizard mode. There's still no way--other than switching to
Traditional or Combination--during normal play (where venom objects can
exist if they were wished for in wizard mode and then left in bones).
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