Moved global font settings from app to stylesheet

images/style-mission.css

+* { font-family: "Bitstream Vera Sans"; font: "Roman"; font-size: 12px; }
 QWidget#colorIcon {}
 
 QWidget {

src/Core.cc

@@ -72,6 +72,8 @@ Core::Core(int &argc, char* argv[]) : QApplication(argc, argv)
     // Show splash screen
     QPixmap splashImage(":images/splash.png");
     QSplashScreen* splashScreen = new QSplashScreen(splashImage, Qt::WindowStaysOnTopHint);
+    // Delete splash screen after mainWindow was displayed
+    splashScreen->setAttribute(Qt::WA_DeleteOnClose);
     splashScreen->show();
     splashScreen->showMessage(tr("Loading application fonts"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));
 
@@ -79,13 +81,15 @@ Core::Core(int &argc, char* argv[]) : QApplication(argc, argv)
     // Exit main application when last window is closed
     connect(this, SIGNAL(lastWindowClosed()), this, SLOT(quit()));
 
-    // Set application font
+    // Load application font
     QFontDatabase fontDatabase = QFontDatabase();
     const QString fontFileName = ":/general/vera.ttf"; ///< Font file is part of the QRC file and compiled into the app
     const QString fontFamilyName = "Bitstream Vera Sans";
     if(!QFile::exists(fontFileName)) printf("ERROR! font file: %s DOES NOT EXIST!\n", fontFileName.toStdString().c_str());
     fontDatabase.addApplicationFont(fontFileName);
-    setFont(fontDatabase.font(fontFamilyName, "Roman", 12));
+    // Avoid Using setFont(). In the Qt docu you can read the following:
+    //     "Warning: Do not use this function in conjunction with Qt Style Sheets."
+    // setFont(fontDatabase.font(fontFamilyName, "Roman", 12));
 
     // Start the comm link manager
     splashScreen->showMessage(tr("Starting Communication Links"), Qt::AlignLeft | Qt::AlignBottom, QColor(62, 93, 141));