MM Scenarios: story dialogs

[SJuliez]

This makes story dialogs in MM scenarios (or wherever they come from) show one after the other instead of all at once. Also, when another modal dialog is up, a story dialog will be postponed until after the other dialog is closed. Only affects story dialogs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.18%. Comparing base (d165031) to head (7a0054f).
Report is 45 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6157      +/-   ##
============================================
- Coverage     29.18%   29.18%   -0.01%     
+ Complexity    13974    13973       -1     
============================================
  Files          2623     2623              
  Lines        266441   266444       +3     
  Branches      47594    47595       +1     
============================================
- Hits          77774    77773       -1     
- Misses       184765   184768       +3     
- Partials       3902     3903       +1     

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