added an option in configuration file to hide/show the 'check update' action

resources/etc/OpenBoard.config

 [App]
 AngleTolerance=4
+HideCheckForSoftwareUpdate=false
 EnableAutomaticSoftwareUpdates=true
 EnableSoftwareUpdates=true
 EnableStartupHints=true

src/core/UBApplication.cpp

@@ -514,6 +514,7 @@ void UBApplication::decorateActionMenu(QAction* action)
             menu->addSeparator();
             menu->addAction(mainWindow->actionPreferences);
             menu->addAction(mainWindow->actionMultiScreen);
+            if (!UBSettings::settings()->appHideCheckForSoftwareUpdate->get().toBool())
                 menu->addAction(mainWindow->actionCheckUpdate);
             menu->addSeparator();
 

src/core/UBSettings.cpp

@@ -234,6 +234,7 @@ void UBSettings::init()
     appToolBarDisplayText = new UBSetting(this, "App", "ToolBarDisplayText", true);
     appEnableAutomaticSoftwareUpdates = new UBSetting(this, "App", "EnableAutomaticSoftwareUpdates", false);
     appSoftwareUpdateURL = new UBSetting(this, "App", "SoftwareUpdateURL", "http://www.openboard.ch/update.json");
+    appHideCheckForSoftwareUpdate = new UBSetting(this, "App", "HideCheckForSoftwareUpdate", false);
     appToolBarOrientationVertical = new UBSetting(this, "App", "ToolBarOrientationVertical", false);
     appPreferredLanguage = new UBSetting(this,"App","PreferredLanguage", "");
 

src/core/UBSettings.h

@@ -250,6 +250,7 @@ class UBSettings : public QObject
         UBSetting* appToolBarDisplayText;
         UBSetting* appEnableAutomaticSoftwareUpdates;
         UBSetting* appSoftwareUpdateURL;
+        UBSetting* appHideCheckForSoftwareUpdate;
         UBSetting* appToolBarOrientationVertical;
         UBSetting* appPreferredLanguage;