Implement CamOps Contract Negotiation

[Algebro7]

This implements the CamOps RAW Negotiation mechanics for the CamOps Contract Market. Players are allowed to reroll each term once, and the term is recalculated based on the MOS/MOF of an opposed negotiation check. For each 2 points of MOS/MOF, the roll on the supplemental terms table is adjusted up or down by 1.

I ended up adding some additional Camops-specific state in AtBContract. Specifically, the initial rolls for the contract so that they can later be adjusted if the terms are negotiated.

Flipping this to Draft since while writing I realized that we would need to serialize the initial rolls as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.42%. Comparing base (4a9cce8) to head (f04a640).
Report is 42 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5054      +/-   ##
============================================
- Coverage     10.43%   10.42%   -0.02%     
+ Complexity     6032     6025       -7     
============================================
  Files           952      952              
  Lines        133878   133927      +49     
  Branches      19436    19443       +7     
============================================
- Hits          13976    13963      -13     
- Misses       118560   118620      +60     
- Partials       1342     1344       +2     

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[IllianiCBT]

Everything looks good. Let's get this in the hands of the testers.