Literal Programming FantasyX examples and integration tests

[jcouyang]

No description provided.

[codecov-io]

Codecov Report

Merging #44 into master will decrease coverage by 28.31%.
The diff coverage is 30.61%.

@@             Coverage Diff             @@
##           master      #44       +/-   ##
===========================================
- Coverage   92.62%   64.31%   -28.32%     
===========================================
  Files          16       15        -1     
  Lines         502      552       +50     
  Branches       55       58        +3     
===========================================
- Hits          465      355      -110     
- Misses         37      197      +160

Impacted Files	Coverage Δ
src/xs/index.ts	100% <ø> (ø)	⬆️
src/forms/index.ts	33.33% <ø> (-60.79%)	⬇️
src/fantasy/planx.ts	17.47% <14.28%> (-82.53%)	⬇️
src/fantasy/state.ts	41.17% <25%> (-40.97%)	⬇️
src/fantasy/index.ts	33.92% <30.3%> (-49.86%)	⬇️
src/xs/most.ts	71.42% <50%> (-1.65%)	⬇️
src/fantasy/fantasyx.ts	58.62% <53.33%> (-41.38%)	⬇️
src/xs/rx.ts	77.77% <80%> (-19.1%)	⬇️
... and 4 more

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