Unify rewards

[Mercerenies]

We have a lot of different reward or effect classes right now, whose methods all boil down to some variant of

interface WhateverEffect {
  fun applyToPlayer(player: Player, context: SomeClass): Unit
}

Among these, we have

• TriviaQuestionReward, which takes only a Player but also has a name: Component field.
• CookieEffect, which has cancelsDefault() and its context is CookieEatenAction (stack, player, and death registry).
• CakeEffect, which has cancelsDefault() and positivity, and its context is the location of the cake in the world.

These three should, at minimum, inherit from a common super-interface.

As a stretch goal, we also have BowserReward, which is different in that it rewards all players (with one player getting a special reward). It's not as similar to the others, but it's worth mentioning.

[Mercerenies]

The four classes, as they appear now (b68435d):

interface TriviaQuestionReward {
  val name: Component
  fun rewardPlayer(player: Player): Unit
}

interface CookieEffect {
  fun cancelsDefault(): Boolean
  fun onEat(action: CookieEatenAction)
}

interface BowserReward {
  fun getMainRewardText(): Component
  fun getSpecialRewardText(player: Player): Component
  fun giveMainReward(player: Player): Unit
  fun giveSpecialReward(player: Player): Unit
}

interface CakeEffect {
  fun cancelsDefault(): Boolean
  fun onEat(loc: Location, player: Player)
}

[Mercerenies]

Doctor Dances also has a reward interface, and so does Prisoner's Dilemma