Small Troopspace refactor

[SJuliez]

This is a small code update around troopspace a.k.a. Infantry Compartment. It moves a few methods up to Transporter as defaults, removes redundant comments and reduces some extreme forms of over-verbose code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.16%. Comparing base (b91c55a) to head (dcc0f8b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6629      +/-   ##
============================================
- Coverage     29.17%   29.16%   -0.01%     
+ Complexity    15444    15430      -14     
============================================
  Files          2870     2870              
  Lines        280207   280183      -24     
  Branches      49325    49320       -5     
============================================
- Hits          81738    81705      -33     
- Misses       192971   192994      +23     
+ Partials       5498     5484      -14     

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[psikomonkie]

What is this for? This looks like it'll conflict with #6627.