Rebalanced Random Unit Quality

[IllianiCBT]

This PR rebalances the random unit quality table to no longer be based on the old AtB tables.

A was 27.78% now 8.33% (-19.45%)
B was 44.44% now 19.44% (-25.00%)
C was 19.44% now 30.56% (+11.12%)
D was 5.56% now 25.00% (+19.44%)
E was 0% now 13.89% (+13.89%)
F was 2.78% now 2.78% (no change)

Units are now 44.45% more likely to be C quality (no maintenance modifier) or better.

[WeaverThree]

Oh nice! That looks like a good distribution!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.53%. Comparing base (3352c18) to head (0702c03).
Report is 23 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5126      +/-   ##
============================================
- Coverage     10.54%   10.53%   -0.01%     
- Complexity     6040     6041       +1     
============================================
  Files           956      956              
  Lines        134181   134213      +32     
  Branches      19481    19489       +8     
============================================
- Hits          14144    14140       -4     
- Misses       118693   118722      +29     
- Partials       1344     1351       +7     

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