E3: Update difficulty menu to use the new sylvan faerie wing palette
New baseframes for the Demon Shapeshifter, including a neutral (default) gender
Implement a gendered non-default Demon Shapeshifter variation

The base (default) variation is now a neutral-gender variation, although
it still uses female nouns and names for convenience.

This variation is hidden from the help system.
E3S7A.1: Convert two Shapeshifters to use the gendered variation