refs #538, Formatting, minor tweaks, comments

* new slot syntax in ATC station component
* formatting, comments
* tab order
* utility function for severity in status message
* null checks in threadutils
* invalidKey function in datastore
* changed data object keys (cached objets)
* added missing value object compare cases
* renamed timer in context network
* finder function for model list
* renamed getContainer to container (as it is just a reference)

src/blackmisc/aviation/aircrafticaocode.cpp

@@ -302,8 +302,14 @@ namespace BlackMisc
                 return Compare::compare(m_legacy, compareValue.isLegacyAircraft());
             case IndexIsMilitary:
                 return Compare::compare(m_military, compareValue.isMilitary());
+            case IndexIsVtol:
+                return Compare::compare(isVtol(), compareValue.isVtol());
+            case IndexIsRealworld:
+                return Compare::compare(m_realWorld, compareValue.isRealWorld());
             case IndexRank:
                 return Compare::compare(m_rank, compareValue.getRank());
+            case IndexDesignatorManufacturer:
+                return getDesignatorManufacturer().compare(compareValue.getDesignatorManufacturer(), Qt::CaseInsensitive);
             default:
                 break;
             }

src/blackmisc/aviation/aircrafticaocode.h

@@ -44,7 +44,7 @@ namespace BlackMisc
                 IndexIsLegacy,
                 IndexIsVtol,
                 IndexRank,
-                IndexDesignatorManufacturer
+                IndexDesignatorManufacturer    //!< designator and manufacturer
             };
 
             //! Default constructor.

src/blackmisc/aviation/airlineicaocode.cpp

@@ -166,6 +166,8 @@ namespace BlackMisc
                 return this->m_designator.compare(compareValue.getDesignator());
             case IndexAirlineCountry:
                 return this->m_country.comparePropertyByIndex(compareValue.getCountry(), index.copyFrontRemoved());
+            case IndexDesignatorNameCountry:
+                return this->m_country.getName().compare(compareValue.getCountry().getName(), Qt::CaseInsensitive);
             case IndexAirlineName:
                 return this->m_name.compare(compareValue.getName(), Qt::CaseInsensitive);
             case IndexTelephonyDesignator: