Draft: Fast healing formula & changes support

KitCatrequested to merge
katsulynx/foundryvtt-pathfinder1:4163-fast-healing-changes into master

Closes #4163

Still needed:

  • Some sort of migration strategy. Since we're moving from free-form text field to formula, I have no clue what's best here, potentially just a full wipe, or stuff the text content into a misc feature.
  • There's a bug with the text to input swapper, where if you don't change anything, it is stuck on the formula. Possibly a general error not directly related to this MR.
  • The inputs text is affected by the inactive class, so need to overwrite that.
  • Lots of extra styling needed just for that one element - wonder if there's something better that can be done instead.

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