feat: Big change to how rolling is performed.

[xdy]

Few user-visible changes other than rolls now showing Sum and Effect at the same time.

Fixes #86

• Please check if the PR fulfills these requirements

• We use semantic versioning (https://github.com/semantic-release/semantic-release to be specific), so follow https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines EXCEPT, don't use 'feat:' if you're not me. Stepping major versions until 1.0 is a deliberate decision (after that, it'll be full semantic versioning.)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Removes setting for whether to show sum or effect on skill roll. Rebuilds dice rolling.

• What is the current behavior? (You can also link to an open issue here)
  Shows either sum or effect.

• What is the new behavior (if this is a feature change)?
  Shows both.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No

• Other information:
  n/a

[github-actions]

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