[LOADOUTS] Use new loadouts with multiple spawn sections, add loadout generation logics placeholders.

[Neloreck]

Changes

• Correct generation of loadout sections with JSX utils, add assertions and validation
• Corrected already used loadouts for char descriptions
• Added handler for loadout generation callback / manager to handle layouts

Checklist

• tests are included
• documentation is changed or added

Links / references

Blocked by: OpenXRay/xray-16#1590

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.06%. Comparing base (e6920f6) to head (1f37e4c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #111   +/-   ##
=======================================
  Coverage   73.05%   73.06%           
=======================================
  Files        1310     1312    +2     
  Lines       37016    37028   +12     
  Branches     6268     6266    -2     
=======================================
+ Hits        27041    27053   +12     
  Misses       9975     9975           

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