Remove Value[Double], make evaluators generic

[sritchie]

Unreal, this all works!

[codecov[bot]]

Codecov Report

Merging #44 into develop will increase coverage by 0.3%. The diff coverage is 37.5%.

@@            Coverage Diff             @@
##           develop      #44     +/-   ##
==========================================
+ Coverage    25.55%   25.85%   +0.3%     
==========================================
  Files           40       42      +2     
  Lines          818      905     +87     
  Branches        29       30      +1     
==========================================
+ Hits           209      234     +25     
- Misses         609      671     +62

Impacted Files	Coverage Δ
...l-core/src/main/scala/io/samritchie/rl/Agent.scala	0% <ø> (ø)	:arrow_up:
...l-core/src/main/scala/io/samritchie/rl/State.scala	29.16% <ø> (+4.16%)	:arrow_up:
...main/scala/io/samritchie/rl/logic/MonteCarlo.scala	0% <0%> (ø)	:arrow_up:
...cala/io/samritchie/rl/util/AffineCombination.scala	0% <0%> (ø)
...rc/main/scala/io/samritchie/rl/book/Chapter5.scala	0% <0%> (ø)	:arrow_up:
.../scala/io/samritchie/rl/policy/bandit/Greedy.scala	0% <0%> (ø)
...rl-core/src/main/scala/io/samritchie/rl/Util.scala	28% <0%> (-18.67%)	:arrow_down:
...rc/main/scala/io/samritchie/rl/book/Chapter2.scala	0% <0%> (ø)	:arrow_up:
.../scala/io/samritchie/rl/value/ActionValueMap.scala	0% <0%> (ø)	:arrow_up:
...ore/src/main/scala/io/samritchie/rl/Weighted.scala	0% <0%> (ø)
... and 20 more

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