Discrete Refactoring

[38]

Tihs closes #80

[codecov]

Codecov Report

Merging #89 into v0.3-pre will increase coverage by 1.83%.
The diff coverage is 69.88%.

@@             Coverage Diff              @@
##           v0.3-pre      #89      +/-   ##
============================================
+ Coverage     63.27%   65.11%   +1.83%     
============================================
  Files            53       56       +3     
  Lines          5117     5268     +151     
============================================
+ Hits           3238     3430     +192     
+ Misses         1879     1838      -41

Impacted Files	Coverage Δ
src/coord/category.rs	79.1% <ø> (ø)	⬆️
src/coord/mod.rs	15.38% <ø> (ø)	⬆️
src/coord/ranged.rs	70.9% <ø> (+28.51%)	⬆️
src/series/histogram.rs	0% <0%> (ø)	⬆️
src/coord/group_by.rs	54.54% <54.54%> (ø)
src/coord/partial_axis.rs	70.58% <70.58%> (ø)
src/coord/discrete.rs	72.94% <72.94%> (ø)
src/coord/numeric.rs	91.74% <84.21%> (+22.17%)	⬆️
src/coord/datetime.rs	86.32% <92.5%> (+5.62%)	⬆️
... and 3 more

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