Special => On Ability Check for features.

[Sam Barrie]

• “If this then that” on Ability Checks, similar to the `Special => On Hit` option
• either something like 'on ability check' or more specific like 'on ability check => history'
• if the former then have the ability to use 'ADD FILTER' on specific rolls

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• support for features like Dwarven Stonecunning or Dragonmark modifiers

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