message: Update retirement code to not use PopulationTable::Role enum
diff: @@ -71,9 +71,9 @@ void Population::spawnPopulation(int morale, int residences, int nurseries, int
  mPopulation.student -= (newRoles.worker + newRoles.scientist);
  /** Workers retire earlier than scientists. */
  - const auto retireRole = randomNumber.generate(0, 100) <= 45 ?
  - PopulationTable::Role::Scientist : PopulationTable::Role::Worker;
  - if (mPopulation[retireRole] > 0) { mPopulation[retireRole] -= newRoles.retiree; }
  + auto& retireRole = randomNumber.generate(0, 100) <= 45 ?
  + mPopulation.scientist : mPopulation.worker;
  + if (retireRole > 0) { retireRole -= newRoles.retiree; }
  }
  