Improve Player API

[olistic]

• Better separation in the Player API:
  • Space API
  • Unit API
  • Turn API
• Updated and improved documentation

[codecov-io]

Codecov Report

Merging #113 into master will decrease coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #113     +/-   ##
=========================================
- Coverage   90.85%   90.76%   -0.1%     
=========================================
  Files          80       80             
  Lines        1017     1007     -10     
  Branches      158      156      -2     
=========================================
- Hits          924      914     -10     
  Misses         77       77             
  Partials       16       16

Impacted Files	Coverage Δ
packages/warriorjs-core/src/Warrior.js	100% <ø> (ø)	⬆️
packages/warriorjs-core/src/Level.js	100% <100%> (ø)	⬆️
packages/warriorjs-units/src/Archer.js	100% <100%> (ø)	⬆️
packages/warriorjs-units/src/Sludge.js	100% <100%> (ø)	⬆️
packages/warriorjs-core/src/Space.js	100% <100%> (ø)	⬆️
packages/warriorjs-core/src/Unit.js	100% <100%> (ø)	⬆️

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