Find and replace http://freecad.org to https://freecad.org

Find and replace:
http:\/\/(.{0,10})freecad
https://$1freecad
Done in all remaining files (after doing it in SVGs in the last commit)

src/Gui/Application.cpp

@@ -2024,7 +2024,7 @@ void Application::runApplication()
     // if application not yet created by the splasher
     int argc = App::Application::GetARGC();
     GUISingleApplication mainApp(argc, App::Application::GetARGV());
-    // http://forum.freecad.org/viewtopic.php?f=3&t=15540
+    // https://forum.freecad.org/viewtopic.php?f=3&t=15540
     mainApp.setAttribute(Qt::AA_DontShowIconsInMenus, false);
 
     // Make sure that we use '.' as decimal point. See also