refs #720, improved distributor and airline/livery detection

* mark data read from DB (req. for string key where existing key value is not reliable indicator for DB data)
* detect distributors by part of model string
* use a simplified name (no spaces, no special characters) to find a match
* allow to obtain model strings (=keys) as set and list

src/blackmisc/simulation/aircraftmodel.cpp

@@ -372,6 +372,7 @@ namespace BlackMisc
 
         bool CAircraftModel::matchesMode(ModelModeFilter mode) const
         {
+            if (mode == All) { return true; }
             return (mode & this->m_modelMode) > 0;
         }