MM Scenarios: Improve game options parsing

[SJuliez]

makes some improvements to gameoptions parsing and adds specific game options to the Kell Hounds/Lowering The Boom scenario
(no impact outside of scenarios)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.17%. Comparing base (a6fee3d) to head (3159eb7).
Report is 27 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6167      +/-   ##
============================================
- Coverage     29.17%   29.17%   -0.01%     
+ Complexity    13973    13970       -3     
============================================
  Files          2628     2628              
  Lines        266583   266576       -7     
  Branches      47615    47582      -33     
============================================
- Hits          77775    77770       -5     
- Misses       184905   184924      +19     
+ Partials       3903     3882      -21     

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[sldfgunslinger2766]

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