Add config variable for specifying a default file name for the database

src/core/Config.cpp

@@ -81,6 +81,7 @@ static const QHash<Config::ConfigKey, ConfigDirective> configStrings = {
     {Config::GlobalAutoTypeRetypeTime,{QS("GlobalAutoTypeRetypeTime"), Roaming, 15}},
     {Config::FaviconDownloadTimeout,{QS("FaviconDownloadTimeout"), Roaming, 10}},
     {Config::UpdateCheckMessageShown,{QS("UpdateCheckMessageShown"), Roaming, false}},
+    {Config::DefaultDatabaseFileName,{QS("DefaultDatabaseFileName"), Roaming, {}}},
 
     {Config::LastDatabases, {QS("LastDatabases"), Local, {}}},
     {Config::LastKeyFiles, {QS("LastKeyFiles"), Local, {}}},

src/core/Config.h

@@ -63,6 +63,7 @@ public:
         GlobalAutoTypeRetypeTime,
         FaviconDownloadTimeout,
         UpdateCheckMessageShown,
+        DefaultDatabaseFileName,
 
         LastDatabases,
         LastKeyFiles,