elo calculation, competition mode for comparing AI

[Vadman97]

Partially implements #56 need way to compare evaluation functions, currently just AI

Allows a way to empirically compare AI and in the future evaluation functions.

Cleaning up code to make printing disableable in both game and AI logic

Adding some tests.

[codecov]

Codecov Report

Merging #69 into master will increase coverage by 2.14%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   65.04%   67.18%   +2.14%     
==========================================
  Files          21       25       +4     
  Lines        1359     1533     +174     
==========================================
+ Hits          884     1030     +146     
- Misses        442      468      +26     
- Partials       33       35       +2

[Vadman97]

pretty big PR - various framework for comparing AI. Need to make it so we can compare different versions of evaluation function, as well as record ELO for benchmark AI that we play against

[gparanjape]

elo math looks good.
+1 for elo, didn't review the other stuff LOL.

I'm contributing!

[Vadman97]

thanks @gparanjape 👍

[dadhia]

I see how the onlyFirstMove bool is passed on to getAllMoves() from getAllMovesCached() and this seems like the appropriate approach to optimization, but I do not see it being passed on to each piece. Ideally, we would just check one piece and see if we can move it. This would be very fast.
@Vadman97, Do you plan on implementing each piece separately in a different PR?
I don't necessarily like that we use a boolean, I would prefer to use a function with a different name but I realize this will require a lot of copy and pasting since the logic is quite similar (just an early return instead of building a list). I think boolean is fine.

[dadhia]

nice optimization. LGTM