Stat variants

This month I kept working on rebuilding the Monster Editor, and in particular the "meta" description of monsters, which appears below the name and above the stats.

While doing this, I realized that the way I built the Names section, allowing different names at different Challenge Ratings, actually provides a much more versatile and user-friendly way to create dynamic stat blocks than the method we've been using so far (mathematical expressions) for other stats like Abilities or Armor Class. I've decided this approach should be extended to those stats as well.

Size, Type, and Alignment, which are part of the "meta" description, will also support variants at different Challenge Ratings. This means you'll be able to create monsters that grow in size as they become more powerful, or corrupted creatures whose alignment shifts toward evil as their bond with dark magic deepens.

Expressions will not be removed from the editor, as they still remain a powerful way to automate dynamic stats that can grow indefinitely. However, stat variants should now be considered the simpler, standard, and preferred approach.

PS: you can test this already in the Editor section.

-Ismael