Update documentation to match state of released game

[1337joe]

Work remaining (future pull request):

• EngineUnit: new breakout of various types of thrust producing modules isn't yet captured

Elements documented from codex but not tested in-game due to lack of access to an element:

• AntiGravityGeneratorUnit
• PlasmaExtractorUnit
• WarpDriveUnit

Breaking changes for using mocks (probably not a complete list):

• Element definition keys have changed to match the default element name in-game (in English). This is typically the displayNameWithSize in the table returned by system.getItem(id).
• IndustryUnit currentStatus field refactored to currentState to better match game behavior.
• Methods deprecated from system/ControlUnit/CoreUnit to Player/Construct don't forward through to Player/Construct, so tests relying on the deprecated method will fail until redirected to the new location.

This addresses the bulk of the work for #4

[github-actions]

Test Results

  37 files    37 suites   1s ⏱️
256 tests 254 ✔️ 2 💤 0 ❌
254 runs  252 ✔️ 2 💤 0 ❌

Results for commit eebb4e2.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Base: 88.72% // Head: 85.49% // Decreases project coverage by -3.23% ⚠️

Coverage data is based on head (21c8bed) compared to base (0bd0500).
Patch coverage: 77.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
- Coverage   88.72%   85.49%   -3.24%     
==========================================
  Files          37       40       +3     
  Lines        4356     5481    +1125     
==========================================
+ Hits         3865     4686     +821     
- Misses        491      795     +304     

Impacted Files	Coverage Δ
src/dumocks/BaseShieldGeneratorUnit.lua	0.00% <0.00%> (ø)
src/dumocks/PlasmaExtractorUnit.lua	0.00% <0.00%> (ø)
src/dumocks/CoreUnit.lua	67.83% <44.19%> (-10.61%)	⬇️
src/dumocks/MiningUnit.lua	81.33% <61.53%> (-11.78%)	⬇️
src/dumocks/RadarUnit.lua	67.56% <64.15%> (-1.10%)	⬇️
src/dumocks/ShieldGeneratorUnit.lua	86.69% <64.28%> (-4.38%)	⬇️
src/dumocks/EngineUnit.lua	82.35% <66.66%> (+2.02%)	⬆️
src/dumocks/ControlUnit.lua	84.35% <69.23%> (-10.74%)	⬇️
src/dumocks/ManualButtonUnit.lua	90.27% <69.23%> (-4.81%)	⬇️
src/dumocks/PressureTileUnit.lua	90.14% <69.23%> (-4.86%)	⬇️
... and 66 more

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