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/stringutils.cpp

@@ -12,6 +12,7 @@
 #include "stringutils.h"
 #include <QChar>
 #include <QTextCodec>
+#include <QRegularExpression>
 
 namespace BlackMisc
 {
@@ -162,6 +163,13 @@ namespace BlackMisc
     {
         return c1.length() == c2.length() && c1.startsWith(c2, Qt::CaseInsensitive);
     }
+
+    QString simplifyNameForSearch(const QString &name)
+    {
+        static const QRegularExpression reg("[^A-Z]");
+        const QString r = name.toUpper().remove(reg);
+        return r;
+    }
 }
 
 //! \endcond