Add initial support for Hiring Hall levels and add new hiring halls

[Algebro7]

This refactors some internals in AtBConfiguration to provide support for different levels of hiring halls, which is necessary to implement support for CamOps. The "public" API hasn't changed except for a new getHiringHallLevel() method, and old save files are of course supported. This information will also be useful for displaying the hiring hall level in the UI, such as on the planetary map.

This also adds a handful of hiring halls that previously weren't in the game based on CamOps and Sarna. I added an approximation of the level based on Sarna in cases where an explicit official hiring hall level wasn't given.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.79%. Comparing base (cef4c6c) to head (fa58da2).
Report is 104 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4659      +/-   ##
============================================
+ Coverage      9.90%   10.79%   +0.89%     
- Complexity     5676     5712      +36     
============================================
  Files           945      952       +7     
  Lines        129636   131308    +1672     
  Branches      19092    19138      +46     
============================================
+ Hits          12836    14181    +1345     
- Misses       115583   115904     +321     
- Partials       1217     1223       +6     

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[Algebro7]

I've cherry picked these commits into my larger camops contract market branch, and given that they aren't needed for other features ATM I'm thinking it makes sense to close this and just merge these changes with PR #4644 . Closing for now but let me know if we want to re-open later for some reason.