Convert Bandits to use ActionValue estimators

[codecov[bot]]

Codecov Report

Merging #53 into develop will decrease coverage by 2.1%. The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop      #53      +/-   ##
===========================================
- Coverage    25.85%   23.75%   -2.11%     
===========================================
  Files           42       42              
  Lines          905     1023     +118     
  Branches        30       37       +7     
===========================================
+ Hits           234      243       +9     
- Misses         671      780     +109

Impacted Files	Coverage Δ
...rl-core/src/main/scala/io/samritchie/rl/Util.scala	28% <ø> (ø)	:arrow_up:
.../scala/io/samritchie/rl/policy/bandit/Greedy.scala	0% <ø> (ø)	:arrow_up:
...rc/main/scala/io/samritchie/rl/book/Chapter2.scala	0% <ø> (ø)	:arrow_up:
.../scala/io/samritchie/rl/value/ActionValueMap.scala	0% <ø> (ø)	:arrow_up:
...cala/io/samritchie/rl/policy/bandit/Gradient.scala	0% <0%> (ø)	:arrow_up:
...ain/scala/io/samritchie/rl/policy/bandit/UCB.scala	0% <0%> (ø)	:arrow_up:
...re/src/main/scala/io/samritchie/rl/Evaluator.scala	84.61% <0%> (-7.06%)	:arrow_down:
...re/src/main/scala/io/samritchie/rl/util/Grid.scala	84.61% <0%> (-0.76%)	:arrow_down:
...rc/main/scala/io/samritchie/connectfour/Game.scala	0% <0%> (ø)	:arrow_up:
... and 5 more

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