enhanced progress/action roll commands

[rsek]

enhancements

• ActionRoll is now distinct from ProgressRoll; both are derived from IronswornRoll, an abstract class that handles roll resolution + embed composition
• strict game terminology on params, class names, etc
• split Result into Outcome (StrongHit, WeakHit, Miss) and IsMatch, a boolean (to handle roll outcome upgrade/downgrading more cleanly, later - technically a weak hit + match is possible on certain moves)
• all dice can have their values preset as optional parameters
• param adds is required by /action-roll, so ppl don't forget to leave them out
• param momentum is required by the /action-roll command, and it resolves both negative momentum (by cancelling action dice) and postive momentum (by adding a reminder to the footer when it can be used)
  • Momentum can be omitted from the ActionRoll class, however, so that asset rolls still work until text input via modals is an option

future expansion?

• some way of upgrading/downgrading roll outcomes - before? after?
• dropdown select (multi) to implement "reroll any dice"
• button to burn momentum and resolve the embed to the new outcome
• past results after reroll/momentum burn could be pushed to a field or something
• constructor overloads, so ActionRoll and ProgressRoll can parse roll data from embeds

[rsek]

forgot i had pullbot activated, i'll put the changes on another branch and open a different PR