Add RGB color to units

[olistic]

Before:

^ Note how the Archer and the Captive had the same color due to the algorithm that was used to select colors for them automatically.

After:

(In the CLI, unit colors are downsampled from RGB to 256 color ANSI for greater uniformity.)

[codecov-io]

Codecov Report

Merging #165 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   92.23%   92.22%   -0.01%     
==========================================
  Files          86       86              
  Lines        1069     1068       -1     
  Branches      173      173              
==========================================
- Hits          986      985       -1     
  Misses         68       68              
  Partials       15       15

Impacted Files	Coverage Δ
packages/warriorjs-units/src/Captive.js	100% <ø> (ø)	⬆️
packages/warriorjs-units/src/Archer.js	100% <ø> (ø)	⬆️
packages/warriorjs-units/src/Wizard.js	100% <ø> (ø)	⬆️
packages/warriorjs-units/src/ThickSludge.js	100% <ø> (ø)	⬆️
packages/warriorjs-units/src/Warrior.js	100% <ø> (ø)	⬆️
packages/warriorjs-units/src/Sludge.js	100% <ø> (ø)	⬆️
packages/warriorjs-core/src/loadLevel.js	89.28% <100%> (ø)	⬆️
packages/warriorjs-core/src/Warrior.js	100% <100%> (ø)	⬆️
packages/warriorjs-cli/src/ui/getUnitStyle.js	100% <100%> (ø)	⬆️
packages/warriorjs-core/src/Unit.js	100% <100%> (ø)	⬆️
... and 2 more

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